Not deleted, but confusing behavior. For several months Facebook would _always_ ask for my password twice. Never accepted the first time even when I copy-paste

Not deleted, but confusing behavior. For several months Facebook would _always_ ask for my password twice. Never accepted the first time even when I copy-pasted the exact same password in both boxes it would only work the second time. This was the same across different computers and browsers. My account is empty (no friends/messages) just used for administering an FB page. I wonder if it looked suspicious.