With they dynamics today with irregular emotional activity, it is not surprising the volume of 6.6M; it's probably buying then selling higher, then buying lower. It can trade beyond the float under unusual circumstances.... no biggie.
if you have 3 mil in buys and 3 mil in sells.. that will be 6 mil volume...
Just to put things in perspective.. I myself bought 500k today... THAT contributed TO 1 mil in volume... (500k buy and 500k in sells from someone else..)