Yea it seems to happen if i put any of my equipment sets in that 12th slot.
http://www.wowinterface.com/forums/a...1&d=1277408956
But the more i mess with it now it looks like it has that equipment set on cool down, or whatever set i put there. it doesn't do it to spells.
http://www.wowinterface.com/forums/a...1&d=1277408956