863.6625 isn't a valid LMR frequency at all, rebanding or no.
I have found that Unitrunker sometimes "finds" incorrect frequencies after a while. Poor decoding rate or a fluke or whatever. Try deleting the channels in question and see if they come back. Also, look at the number of hits for each frequency, you may find that the questionable channels show up but don't have any activity.
FWIW, I was a trunker fan for years, but then discovered trunk88. I've used unitrunker some, but for a simple, straight-forward decoder I now prefer trunk88. It now has a windows version which is a plus. And I love the data file that it creates that shows a list of talkgroups active on a particular talkgroup, and other talkgroups that radio has been active on. It's great for correlating unknown talkgroups to known talkgroups. Give it a try.
