Is it possible that availability queries don't accurately reflect true availability?

Was waiting for my EUA on SJU-DTW. Showed P2F2 right after the PE EUA (I'm guessing cause it was P7F7 seven days out). Seat maps confimed this with two open FC seats (not that we should ever use seatmaps to confirm anything but our seat assignment).

Today was the 4 day window, my GE EUA cleared ^, BUT availability is still showing P2F2. Here's the kicker, seat maps shows 8 open seats in FC (plane is a 320). So, unless the same # of PNR cancellations = the number of GE's getting cleared, something is screwy...

Go figure.