It seems the F620 thinks my new personal running best is based on my bike home from work. Can the device tell the difference vis à vis personal bests. I no longer get PB alerts when running because of the bike times.
At last check, the 620 didn't have a bike mode. If this is still the case every activity you record with the 620 is assumed to be a run, and there is likely nothing you can do about it aside from a factory reset and no longer using it to record your cycling activities.