Aaand... @ieva says it's solved!
The message is meant only for new users - we recently implemented a new "first 10 easy annotations" feature along with a walk-me-through, which walks a new user through the game, and gives extended feedback on the first 10 training movies (and allows them to try again, even if they get them wrong!)
Turns out that you have seen 10,023 movies or so, but the system misread that as 10 due to number formatting, and kept insisting you just finished the first 10 !
Thank you for your patience with this and for reporting it
Happy continued catching!