Usually happens to me when I bid on a player a split second after someone else. The annoying ones are when you're bidding on a player and then someone outbids you but it won't let you then bid again.
It's because the price didn't update and your bid was lower than the current bid. You often get this when mass bidding. Try hovering over a player for a few seconds before bidding.
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cant believe transfer market been a write off all year. (well, i can but...)