This 64-66 area is very hard for many days already. Lots of sellers, one huge via NITE putting back up large chunk on ask. Might be retail, hard to say.
One tip-off that machine or bot trading is happening is to look at the bid/ask. If the reading is in hundredths or thousandths, it is from a bot. The programs work by trading high volumes at incredibly slim margins. They expect to make their profit when humans make their buys/sells at whole number prices.