I'm using Sophisticate Storage & Backpacks in my personal mod pack for me and my friends and we're having an issue with items going into the chest.

I have a farm which auto harvests (Pylons Mod) and places items in the inventory above where the sophisticated storage chest is. Whenever it would harvest it wouldn't stack with its current stack and create a new stack of 1-2 items. I've tried with a regular hopper as well and this seems to be the same issue.

In this picture, I used a hopper to add diamond essence to the chest and it created a new stack. So within a matter of 2 mins all the slots of the chest gets filled with 1-2 items and just stops any inputs.

Sharing the modlist below

modlist.txt

Some mod in that list is attaching data to the stacks and making them different that way. If you can figure out which one I can take a look if there's anything I can do on my side, but very likely they need to fix not to mess up stacks like this