Occasionally the login screen can continue to loop over and over again when you are trying to log in.  

There can be several reasons for this but in the first instance check your pc/laptop clock time to ensure it is correct. Having a system time which is 5 minutes or more behind the actual time can cause this looping issue.

Also, if your time is set correctly, you can also clear your web browser cache, a quick way to do this is to go to:

https://<your_org>.staffircle.net/static/refresh.html 

( your_org is the name of your organisation when you log into staffcircle)