whenever I activate the light level displayer, the numbers/Xs float and intersect walls.
this affects built structures as well.

They say a picture is worth a thousand words, so:

some data about my minecraft:
version:1.17.0 fabric
mods:
Caves and Cliffs add-on for William Wythers' Overworld (by cristelknight) (this may be the problem)
Fabric API (by modmuss50)
Simple Voice Chat (by henkelmax)
CraftPresence (by CDAGaming_)
OptiFabric (by Chocohead)
ShulkerBoxTooltip (by MisterPeModder)
Better Waxed Copper (by redy1aye)
Authentic Shadows (by liahim85)
Mod Menu (by ProspectorDev)
Controlling for Fabric (by Jaredlll08)
Xray Ultimate (by Filmjolk)
BetterVanillaBuilding - Bushy Leaves Addon (by stefanj2_)
Architectury API (Fabric) (by shedaniel)
Snowier Snow (by GrandMagusOfficial)
Better Third Person (by Socolio)
Falling Leaves (Fabric) (by RandomMcSomethin)
Dark Loading Screen (by Neecko5b84)
Better Dropped Items (by Draylar1)
Roughly Enough Items Fabric (REI) (by shedaniel)
VoxelMap (by MamiyaOtaru)
William Wythers' Overhauled Overworld (by cristelknight)
ToroHealth Damage Indicators (by ToroCraft)
Dynamic Music (by LudoCrypt)
BetterF3 (by cominixo)
WorldEdit (by sk89q)
WTHIT (by badasintended)
Clumps (by Jaredlll08)
Dynamic FPS (by juliand665)
Light Overlay (Rift/Forge/Fabric) (by shedaniel)
Cloth Config API (Fabric) (by shedaniel)
Ambient Environment (by Jaredlll08)
AppleSkin (by squeek502)
Creative Command Items (by coderx_gamer)
CameraOverhaul (by Mirsario)
preview OptiFine 1.17 HD U G9 pre22

the light levels follow a pattern completely different from the terrain and placed blocks