This is likely a JavaScript race condition created by autofill on the password field. Lots of websites have this now; some fucking framework or another doesn’t handle a paste/autofill on fields. Try adding a space after the password and then remove it again, see if it trips the validation checks
When they run out of datacenter investment, they will run large AI queries across millions of mobile devices; Like a shitty, unsolicited, reverse SETI@Home