I can't login to my Google account

[levider]

Hello
I decided to install Iron Browser, because it has google sync and it's much faster than chrome
So the problem is that I can't log in to my account

I go to Sign In section, type my login and there's info "This login already exist on the device". When I tried my sister's account then it was ok (there was section to type password)

Versions
61.0.3200 stable, and
61.0.31xx from GP store