That's often a connectivity problem. It could be local, on the servers side.... or somewhere in the depths of te internet.
If it is the games fault, it always resolves itself at some point.
You can also check if it is local by doing the following:
- Refresh the site
- Log out, then log in again and see if that helps.
- Restart your browser/clear cookies.
- Use the privacy/incognito mode or your browser.
- Try with another browser (a "clean" one, means less add-ons as possible, some of them could cause any kind of havoc, some even when disabled/deactivated).
- Restart your computer and/or check your internet connection.
Again, the problem always goes away at some point.