That's what mine did for a few hours until it seemed to iron itself out.
I'm fairly certain it responds to throttle position. I tend to intentionally drive a little bit more aggressive during the 'learn' phase and i notice the transmission will hang on to gears longer which i appreciate.
BTW...this is my third focus (i had a 2001 and a 2005) and about the 15th Ford i've owned...(i just got my wife a Ford Flex...which is straight up sweet) and i'm really impressed with what Ford has done. The details seemed to have been sweated...from the dash texture to the technology they packed in...they definitely were aiming for head of the class.
As much as I miss my Mazda3 5 door...this should fill the void nicely. 8-)