In this room there is one bed, but there are two bed icons in the GUI

GUI with two bed icons showing:

Only one bed

Inventory Tabs 0.7.0
Fabric API 0.53.4
Minecraft 1.18.2
Java MSOpenJDK amd64 17.0.3

Mods:
[✔️] 3dskinlayers-fabric-1.4.5-mc1.18.2
[✔️] achievementplates-1.18.2-1.6.1
[✔️] AdvancedCompass-fabric-1.18.2-1.2.7
[✔️] AdvancementPlaques-1.18.2-fabric-1.4.5
[✔️] agb-1.18-1.0.3
[✔️] amecs-1.3.8+mc.1.18.2
[✔️] Amplified_Nether_v1.1.1
[✔️] appleskin-fabric-mc1.18.2-2.4.0
[✔️] architectury-4.4.68
[✔️] armor-stand-swap-1.0.2
[✔️] ArmorSoundTweak-5.0.0-fabric
[✔️] auto_third_person-1.18-1.1.0
[✔️] auudio_fabric_1.0.3_MC_1.18-1.18.2
[✔️] AxesAreWeapons-1.5.1-fabric-1.17.1
[✔️] axolotl-item-fix-1.1.3
[✔️] badpackets-fabric-0.1.2
[✔️] balm-fabric-3.0.0+0
[✔️] BedBenefits-Fabric-1.18.2-6.0.2
[✔️] beehive-tooltips-fabric-1.4.2
[✔️] Better-Enchantment-Boosting-1.2.0
[✔️] BetterF3-1.2.5-Fabric-1.18.2
[✔️] BetterResourcePackSorting-1.1.1
[✔️] BetterThirdPerson-Fabric-1.18.2-1.7.3
[✔️] BiomeParticleWeather-2.4.7
[✔️] blur-2.4.1
[✔️] boatcontainer-1.2.0-1.18
[✔️] boneequipment-fabric-1.18.2-v1.0.1
[✔️] Bookshelf-Fabric-1.18.2-13.1.16
[✔️] brb-1.18.2-fabric-1.5.6
[✔️] cammies-minecart-tweaks-1.5
[✔️] camp-fires-cook-mobs-1.2.4+MC1.18-1.18.2
[✔️] chat_heads-0.6.0-fabric-1.18.1
[✔️] chipped-1.2
[✔️] CleanView-1.18.2-v1-fabric
[✔️] clear-skies-fabric-mc118-2.0.92
[✔️] cloth-config-6.2.62-fabric
[✔️] Clumps-fabric-1.18.2-8.0.0+8
[✔️] Coins-Fabric-1.18.2-7.0.1
[✔️] collective-fabric-1.18.x-4.26
[✔️] connected-doors-1.1+1.18
[✔️] Controlling-fabric-1.18.2-9.0+19
[✔️] copperlamp-2.1.0
[✔️] craftingtweaks-fabric-1.18-13.0.0
[✔️] crawl-0.10.6
[✔️] creeperoverhaul-1.18.2-1.3.1-fabric
[✔️] Croptopia-1.18.2-FABRIC-2.0.3
[✔️] cryingportals-fabric_1.18.x-1.2
[✔️] cullleaves-2.3.2
[✔️] custom-lan-1.18.2-v2.0.1
[✔️] customfov-fabric-1.4.1-1.18.1
[✔️] darkness-fabric-mc118-2.0.91
[✔️] dashloader-4.0.0
[✔️] DeathKnell-Fabric-1.18.2-3.0.2
[✔️] DetailArmorBar-2.6.2+1.18-fabric
[✔️] DistantHorizons-1.6.3a-1.18.2
[✔️] DraggableResourcePacks-2.0.0
[✔️] dragonloot-1.1.0
[✔️] DripSounds-1.18-0.3.0
[✔️] duckling-1.0.5-fabric
[✔️] dynamic-fps-2.1.0
[✔️] dynamiccrosshair-3.0.1+1.18.2
[✔️] dynamiccrosshair-compat-1.0+1.18.2
[✔️] EasyMagic-v3.3.0-1.18.2-Fabric
[✔️] ecologics-FABRIC-1.18.2-1.5.4
[✔️] effective-1.2.1
[✔️] elytratrinket-fabric-3.0.0-1.18.1
[✔️] enchancement-1.18-18
[✔️] EnchantmentDescriptions-Fabric-1.18.2-10.0.3
[✔️] enhanced_attack_indicator-1.0.3+1.18
[✔️] enhancedblockentities-0.7+1.18.2
[✔️] entityculling-fabric-mc1.18-1.5.1
[✔️] EquipmentCompare-1.18.2-fabric-1.2.12
[✔️] exlineawnings-fabric-1.18.2-v1.0.3
[✔️] fabric-allay-1.18.1-4.0.0
[✔️] fabric-api-0.53.4+1.18.2
[✔️] fabulousclouds-0.3.0
[✔️] fallingleaves-1.11.1+1.18.2
[✔️] fallthroughslime-fabric_1.18.x-1.4
[✔️] fastopenlinksandfolders-1.1.1
[✔️] Fireplace-Lib-6.3.1+1.18.2
[✔️] firstperson-fabric-2.1.0-mc1.18-pre1
[✔️] ForgeConfigAPIPort-v3.2.0-1.18.2-Fabric
[✔️] forgetmechunk-1.18.X-1.0.3
[✔️] geckolib-fabric-1.18.2-3.0.35
[✔️] gilded-1.18-1.0.1
[✔️] global_packs-fabric-1.18.2-1.12.2
[✔️] guard-villagers-fabric-1.18.2-1.0.14
[✔️] HealthOverlay-1.18.2-6.2.4
[✔️] here-be-no-dragons-1.0.0
[✔️] Highlighter-1.18-fabric-1.1.2
[✔️] hoetweaks-fabric_1.18.x-1.4
[✔️] holograms-1.3.1+1.18.2
[✔️] icarus-1.11
[✔️] Iceberg-1.18.2-fabric-1.0.38
[✔️] ihgm-1.0.1
[✔️] illuminations-1.10.4
[✔️] immersive_weathering-2.5.3
[✔️] improved-fire-overlay-1.18.2-v1.2
[✔️] indicatia-mc1.18.2-v6.2.0-fabric
[✔️] indium-1.0.3+mc1.18.2
[✔️] infusion-table-mod-1.1.0
[✔️] interactic-0.1.10+1.18
[✔️] InventoryProfilesNext-fabric-1.18.2-1.4.0
[✔️] inventorytabs-0.7.0-1.18.x
[✔️] InvMove-1.18-0.7.0-Fabric
[✔️] ironchests-2.0.3-fabric
[✔️] ItemBorders-1.18-fabric-1.1.5
[✔️] itemflexer-1.2.4
[✔️] Jade-1.18.2-fabric-5.99.5
[✔️] justmobheads-fabric_1.18.x-5.4
[✔️] kleeslabs-fabric-1.18-11.0.0
[✔️] konkrete_fabric_1.3.3-1_MC_1.18-1.18.2
[✔️] lambdabettergrass-1.2.3+1.18
[✔️] lazy-language-loader-0.3.0
[✔️] lazydfu-0.1.2
[✔️] LeftHanging-fabric-1.18.2-3.2.0.2
[✔️] LegendaryTooltips-1.18.2-fabric-1.2.5
[✔️] lenientstacksize-1.3.0
[✔️] libmultipart-all-0.7.2
[✔️] lithium-fabric-mc1.18.2-0.7.10
[✔️] lucys-sloths-1.0
[✔️] MagicalForest-fabric-1.18.2-2.0.3
[✔️] mcw-bridges-2.0.3fabric-mc1.18.2
[✔️] mcw-roofs-2.1.2fabric-mc1.18.2
[✔️] merenc-fabric-1.18.2-v1.4
[✔️] modmenu-3.2.3
[✔️] netherite-nuggets-1.4.1+1.18.2
[✔️] netherportalspread-fabric_1.18.x-5.7
[✔️] nmuk-1.0.1+mc1.18-pre1
[✔️] notenoughanimations-fabric-1.6.0-mc1.18.2
[✔️] onsoulfire-1.18-3
[✔️] paginatedadvancements-1.0.1
[✔️] pal-1.5.1
[✔️] passiveendermen-fabric_1.18.x-2.3
[✔️] Patchouli-1.18.2-67-FABRIC
[✔️] Pehkui-3.3.3+1.14.4-1.19.1
[✔️] physics-mod-2.7.3-mc-1.18.2-fabric
[✔️] powershot-1.4.0-1.18.2-fabric
[✔️] PresenceFootsteps-1.5.1
[✔️] PuzzlesLib-v3.3.5-1.18.2-Fabric
[✔️] quickshulker-1.3.6-1.18
[✔️] recipecache-0.2.1-1.17.1
[✔️] reroll-1.5.0-1.18.2
[✔️] RingsOfAscension-1.18.2-1.0.1
[✔️] ruined-equipment-1.4.1+1.18.2
[✔️] saplanting-fabric-1.18.2-1.1.1
[✔️] seamless-loading-screen-1.4.0+1.18.2
[✔️] shulkerboxtooltip-3.0.10+1.18.2
[✔️] slipperywalls-1.0.0+1.17
[✔️] SmoothCoasters-1.18.2-v1
[✔️] SmoothScrollingEverywhere-3.0.4
[✔️] snowyleavesplus-0.1.2
[✔️] sodium-fabric-mc1.18.2-0.4.1+build.15
[✔️] solid_mobs-1.0-mc1.18.x
[✔️] soundcategories-1.2.2+1.18
[✔️] soundphysics-fabric-1.18.2-1.0.6
[✔️] spyglass-improvements-1.2+mc1.18.2+fabric
[✔️] starlight-1.0.2+fabric.89b8d9f
[✔️] TaxFreeLevels-1.3
[✔️] telepistons-1.0.2
[✔️] TerraBlender-fabric-1.18.2-1.1.0.102
[✔️] The_Graveyard_1.9_(FABRIC)for_1.18.2
[✔️] The_Graveyard_Biomes_1.1(FABRIC)_for_1.18.2
[✔️] the-box-trot-1.3
[✔️] TinySkeletons-v3.2.1-1.18.2-Fabric
[✔️] tooltipfix-1.0.4-1.18
[✔️] torchhit-1.18.2-2.0.0.0-fabric
[✔️] travelers-backpack-1.18.2-7.1.0
[✔️] trinkets-3.3.1
[✔️] Unforgiving-Void-3.1.3+1.18.2
[✔️] veinmining-fabric-0.0.12-1.18.2
[✔️] villagernames-1.18.2-4.0.4
[✔️] visuality-0.4.2
[✔️] VisualWorkbench-v3.3.0-1.18.2-Fabric
[✔️] walljump-fabric-1.4.7+1.18.2
[✔️] wanderingcollector-1.1.2+mc1.18.2
[✔️] WaveyCapes-fabric-1.2.0-mc1.18
[✔️] window_title_changer-2.1.1-1.18
[✔️] WindowedFullscreen-1.18-fabric-1.0.1
[✔️] WinterCoats+v1.0+MC1.18
[✔️] wolves-with-armor-1.7.1-1.18.2
[✔️] wooltweaks-fabric_1.18.x-1.5
[✔️] worldtime-1.18.2-fabric0.47.10-1.3.1

Side question, are there supposed to beds in the UI?

This will be fixed in the next update.

The reason there are two beds is because one bed is made up of two block entities. I was planning on making a TabProvider so that a single bed tab would appear only when it is a valid time to sleep, but later decided against it as InventoryTabs should be for inventories only.

I then forgot to exclude the bed block tab haha

That's very interesting, I totally forgot to consider the bed is 2 blocks. Scratched my head and had a laugh about it for a while.

I'm glad it's being removed :)

Fixed in 0.8.0

This will be fixed in the next update.

The reason there are two beds is because one bed is made up of two block entities. I was planning on making a TabProvider so that a single bed tab would appear only when it is a valid time to sleep, but later decided against it as InventoryTabs should be for inventories only.

I then forgot to exclude the bed block tab haha