It's not an issue with the game, but in the "Play Game" tab of this website (mentioned by D-ead7Dog).
As for me, I had to type in my username and password and then press "login" two or three times in a row before it actually logged me in. This problem seems to be consistant across browsers, as this is the case in Chrome, Firefox and Edge. I don't know why you wouldn't be able to log in AT ALL though, as this seems it would only affect the Chrome browser at a later date... Either way, the site deleton.com seems to be linked with the advertisements shown when accessing the login page, meaning it's not a software issue nor a hardware issue of the computer itself.