Objects disappearing in game.

I'm getting some strange things happening in game. I have a few events that add an item to your inventory, I have been noticing that sometimes they disappear when I move them or stack them if I have more of the Item.

Now I did go through it all, looks good and compiles, Hell, it even works in game but that one Item disappears.

Could it be that I made some textures 32x32 and some 16x16?

I have no Idea haha