After logging out and coming back to the game, the sign post that was near me is still there but the signs are gone. Note that this doesn't happen to sign posts that are far away.

Minecraft: 1.10.2
Version: signpost-1.10.2-1.05.5
Forge: 12.18.3.2316

See full list of mods below (LordDan's Banished 2 modpack, plus upgraded forge and some mods)

'[MC 1.10.X] BetterCombatMod 1.4.jar'
1.10.2-ExpandedIndustry-1.1.0b.jar
1.10.2-HardLib-v1b.jar
agricraft-2.0.0-0.10.0-a18.jar
animania-1.10.2-1.1.5.jar
antiqueatlas-1.9.4-4.4.5.jar
AppleCore-mc1.10.2-2.2.0.jar
AppleSkin-mc1.10.2-1.0.5.jar
'Better With Mods-0.14.24-1.10.2.jar'
betterbeginnings-MC1.10.2-b0.9.8-R6d.jar
BetterFps-1.4.5-1.10.jar
boatifull-0.4.0.jar
Chameleon-1.10.2-2.3.0.jar
'Claycraftmod v3.0 - MC1.10.2 Forge.jar'
compatlayer-1.10-0.2.9.jar
CoralReef-1.2.jar
CraftTweaker-1.10.2-3.0.26.jar
'Customized Dungeon Loot 1.10.2 (v.1.0.1).jar'
'CustomMobSpawner 3.10.1.jar'
dropanything-1.10.2-0.0.1.jar
"DrZhark's Mo'Creatures Mod-10.0.6.jar"
DynamicSurroundings-1.10.2-3.4.5.6.jar
EnderZoo-1.10-1.2.3.44.jar
Farseek-1.9.4-2.1.jar
FastLeafDecay-v11.jar
FatSteve-alpha-0.0.4.jar
finite-water-control-1.10.2-1.0.jar
FriendlyFire-1.10.2-1.3.0.jar
h3ntlibs
HardcoreDarkness-MC1.10.2-1.9.jar
hardcoreore-1.10.2-0.0.32.jar
HardModeTweaks-1.10-1.2.2.jar
HungerOverhaul-1.10.2-1.1.0.jenkins118.jar
Hwyla-1.8.17-B31_1.10.2.jar
incontrol-3.5.5.jar
infinitylib-0.10.0.jar
itlt-1.10-1.0.0.jar
jei_1.10.2-3.14.7.420.jar
LunatriusCore-1.10.2-1.1.2.38-universal.jar
materialchanger1.0-1.10.2.jar
MCA-1.10.2-5.2.3-universal.jar
mobends-0.22.5_for_MC-1.10.2.jar
MTLib-1.0.3.jar
MultiMine-1.10.2.zip
NewWorldOrder-1.10.2-1.0.0.jar
PotionCore-1.5.2_for_1.10.2.jar
PrimalCore-0.2.39.jar
QualityTools-1.0.4_for_1.10.2.jar
RadixCore-1.10.2-2.1.3-universal.jar
RealisticItemDrops-1.0.9.jar
RTG-1.10.2-4.2.0.0-snapshot-3.jar
signpost-1.10.2-1.05.5.jar
simplebarrels-1.26e.jar
simplebedding-1.0.0.jar
simulatednights-1.11.2-1.2.0.jar
SoundFilters-0.9_for_1.9.4.jar
special_ai-1.10.2-1.1.3.jar
SpiceOfLife-mc1.9.4-1.3.8.jar
Stackie-1.10.2-1.6.0.44-universal.jar
'Stellar API-0.5.4.1.4.jar'
'Stellar Sky-0.5.5.1.9.jar'
stg-1.0.2.jar
StorageDrawers-1.10.2-3.7.9.jar
Streams-1.9.4-0.3.jar
structpro-3.8-1.10.2.jar
Survivalist-1.10.2-1.10.1.jar
ThingsThatMatta-1.10.2-r1.jar
ThirstyBottles-1.10.2-1.0.1.0.jar
Timberjack_1.10.2-1.5.jar
ToughAsNails-1.9.4-1.1.1.21-universal.jar
UndergroundOcean-1.1.0_develop_a69b2f0_alpha.jar
'VisibleArmorSlots[1.10.2]-2.1-legacy.jar'
WearableBackpacks-1.10.2-1.7.0.jar
wolfarmor-1.4.1.0.jar
WTF-Expedition-Gameplay_1.10.2_v-1.1.jar
WTF-Expedition-WorldGen_1.10.2_-v1.5.1.jar