I have the same problem and I have a theory about what’s going on. It doesn’t seem to happen to me (this 5/5 issue) until I change teams. Most recently I changed teams and I noticed that the next free agency period I had 2/5 slots filled instead of 5/5 like it seems to be when this glitch happens. My guess is that it’s still tracking my previous team and counting their five free agency offers to me. The clue was the 2/5 thing, because in this case my previous team only had two roster spots remaining. Seems to me if this is actually the case it should be easy enough for them to go in and fix it.
But don’t even get me started on my thoughts on. Wing an unpaid play tester…