when i use the ar, or other two handed weapons, it shows two models

when using these Galacticraft 1.12.2 mods (GalacticraftCore + Galacticraft-Planets + MicdoodleCore) it happened two guns in hand and point to two direction.

is there any way to fix it without uninstalling any mods?

This is fixed in newer versions of the mod. I won't be patching for 1.12.2, critical bugs only.