I started a game with only bots, then tried to resign. After being stuck in some kind of loading screen for a minute, I closed the browser tab.
Now, whenever I go to dominion.games and login, it tried to reconnect me to that game. pressing the "Cancel and Resign" button makes the loading screen briefly disappear, so I can temporarily see the regular menu, before coming back.
I tried deleting my browser cache and search for cookies(none found).