Login issues - possible hacking attempt

When I tried to log into xfinity email using the Google Browser on my Windows 10 PC this morning at this URL (https://mail.google.com/mail/u/0/#inbox), I was prompted for and provided my email address, but when I submitted it, after a moment, it sent me back to the prompt for providing my email address ... again. The second time I provided my email address to login, it prompted me for my password. I provided this, but instead of immediately logging me in, it sent me back to the password prompt to provide my password ... AGAIN. I didn't provide it this time and instead flushed cache in my browser, then tried to log in again.

I tried and got variations on this duplicate form on login problem (had to provide email address twice or had to provide password twice). This is either a technical bug or someone is trying to send a fake xfinity login page to harvest my credentials, but they're doing it poorly (it shouldn't require me to provide the information twice, it should just get my info and then log in with it invisibly.

Since I'm using my bookmarked login URL (see above), this would most likely happen if you have a DNS poisoning attack going on that's providing a spoofed login site instead of a real one.

Can you check into this? Since after multiple cycles of purging my cache and trying again EVENTUALLY got me to a successful login with only one request for email and one request for password, it seems to be sporadic, so it's more likely a bug than an attempt to harvest my credentials, but you should look into it.