Dragging Items auto split?

When I have 100k stone in my inventory and I drag it to another slot in my inventory, it only moves 1/3 of it?

On a side note, anyone know the plug that shows <player> killed <player/entity> at <range> meters, in chat?
[DOUBLEPOST=1434346197][/DOUBLEPOST]Turns out it's whenever I have a 100k stack of any item in my inventory. Instead of moving the stack of 100k it only moves 34,464 and leaves 65,536 in place.
[DOUBLEPOST=1434350024][/DOUBLEPOST]@Wulf On most of my plugins, I'm allowed to use the console commands, but the in-game commands come up as "unknown".. Do you know how I can fix this?

 

Thank you.