There's an ad for "Login Blocker" that looks like the Login button but takes you to a site that wants to add an extension to your browser. If you really hunt around you can see the original Login button. Can you not remove that objectionable ad?
Craig, if you install Ad Block it will stop this appearing and leave the normal log in screen below. The button you refer to looks like something from Google Ads, which I don't see unless I turn Ad Block off.
I will pass this on, but I don't know if we can turn one Google Ad off.