odd pickup inventory interactions

[Former user]

So when I pick up items, they don't stack in my inventory EX: I pick up 2 oak logs and they go into slots 1 and 2 instead of just putting both in 1 also even after they're picked up they wont then stack, they refuse to stack and they stay separate, it goes away when i remove this mod but its SOOOO useful.

[Requios]

What minecraft version are you playing and what mod version?