Mod Version: SimpleStorageNetwork-1.12.2-1.2.9
Pack: Bounds vr. 2.7
Issue: The crafting feature that Better With Mods add to create planks from wood logs and thus get bark. When shift clicking causes the axes to duplicate to some outrageous numbers.

I think this was fixed in 1.3.0 it sounds very familiar.

Also 1.4.0 is out now which changes many things. ALso suggest you use FastBench with it. Does this still happen in new versions? https://minecraft.curseforge.com/projects/simple-storage-network/files/2617829