Seatcounter and United.com information shows you available tickets and seatmaps show you available seats - and these are radically different pieces of information. looking at both will always give you a more complete picture, but you shouldn't expect them to be the same.

Also you should always remember that F9 C9 Y9 and everything else zero'd out could only mean 9 available tickets, not 27 available tickets, since those can be the same space in each fare bucket. In other words there are 9 F spaces, but United is willing to take Y fares for those seats of that is all that is forthcoming. This is especially likely if they know they have a healthy list of people willing to pay for an upgrade.