Don't panic. BA do not regularly move F passengers - irrespective of reward/revenue status.

The fact there are no CW seats being sold may simply reflect that Y is already oversold and that, based on historical data, they are better offering additional Y seating, on the premise that some will be bumped up to club, than try to sell remaining CW seats.

I have always monitored things, and they always seem to work out fine. BA's computer (unlike ba.com) is very clever