user can split stack and it deletes

Middle mouse a stacked item then split it it will delete the item 

Looks like there is another stack size controller installed on your server.

hmm ill check it out thanks

same issues here with cooking 2.0 stuff etc.

If you try to right click to split it into 1 stacks, or middle click it to split a stack in half the food will despawn.

same here when i split lets say 50k i get 25k on one stack and the other disappears.