Hello,
This is most likely caused because you clicked “download”. You must click upload.
To solve this issue, go back to a backup from last night/after you finished your reviews so you don’t have to do them again
You can see how to do so here: https://www.youtube.com/watch?v=rHnUgNIJcR4&t=0s
After you have restored from a backup and your cards are reviewed/not “unreviewed”.
You can click sync and this time click “upload to ankiweb”
This post can explain the difference between download vs upload to ankiweb: Should I click upload to ankiweb or download from ankiweb?