This happens when I click "Ready" in any table. I get a browser pop up "Dominion.games says: Already starting."and then nothing.
Unfortunately, there is a problem with the servers happening regularly recently that will cause this behaviour. The best idea is to leave the table and create a new one, hoping that it will not be created on the faulty server.
Version 1.3.11 is live now that tries to fix the problems of games not ending or "game already starting".