I just noticed today that I am having the same problem. The more time I spend with the Home Patrol the more P#$$*! Off I get with it. I'm really starting to wish I had spent the $500 bucks on a BC996xt
I've been able to duplicate this issue on a trunked system... during normal full scan of a favorite.. Tap the channel to hold, then tap the department/group.
Both are now on hold (yellow).
Now Tap the channel to resume scanning,
the department/group jumps to the FIRST department/group as you have saved it on your favorite. In this example, my favorite for Ohio/Summit 800, Akron Fire is my first group .. I have 7 other groups saved .. no matter what other channel and group I hold on, when the channel is released, it jumps to Akron Fire and remains on hold for this group.