whenver I try to split a stack in my inventory i get kicked from the server and the followin error in  rcon.

AssertionException: Assertion failure. Value was False
Expected: True
split_Amount <= 0

This issue should be resolved in v3.1.1. If you encounter the issue again let me know.

AssertionException: Assertion failure. Value was False

Expected: True

split_Amount <= 0 and kicking players when they move stacks

Alright, then another plugin is conflicting with StackSizeController. Please run "o.plugins" in the console and list them here, or if that needs to be private, PM them to me and I'll try to figure out which is causing the conflict and if I can work around it.

it will.
sometimes you may have to return processed, but do nothing.
bouncing the wrong ones may look like a cheat manipulation...at the client.

edited