sophisticated backpack items disappeared and waystones reset bug

so i've been playing a modpack i made with terramity and many other mods including sophisticated backpack and waystones and today after playing the confluence otherworld modpack with a friend i then came back to my terramity modpack and my backpack was suddenly empty and all of my waystones got reset like seriously what happened ? my terramity modpack has :

terramity

sophisticated backpacks

waystones

bettercombat

immersive portals

sodium

oculus

nature compass

timber replant

xaero's minimap and world map

quark

just enough items

just enough resources

bridging mod

embeddium

DoG (devourer of gods mod)

Jade

legendary tabs

no template for netherite upgrades

true ending : enderdragon overhaul