AutoStackFix is a mod to fix the issue of losing items when playing online with other people. This is done by fixing the way that the server handles merging stacks.

When you play online, you sometimes have items lying on the ground that are automatically merged. It's not a big issue when you are playing on your own, but when you play with other people, this can cause issues.

When you play online, you lose items on the ground. When you pick them up, they are gone. It's a big issue because you have to wait for other people to pick them up and they can be lost forever.

AutoStackFix fixes this issue by only allowing a certain number of items to be merged.