[I am looking for a mod that can locate and fix item & resource stack size management."]

I think it all started around 2 months ago, though I've updated my game through Steam (On My PC) & the Nitrado Server as well.

Since then I couldn't re-stack certain items and in attempts to move items only parts of the stacks move. Like 100/1000 would move. The only way to move that* stack is to place a single item in the slot I intended, swap the seemingly bugged items with that item, and if that stack remains after crafting something from them, it would keep bugging until dropped. Wasted farming time or just suffer the loss of slots.  
(even after a complete wipe and re-install several times)

The problem continues with High Quality Metal, Metal Shards, [random] ammo, and so on. This is something which happens totally random^ & unpredictable.