vim does not delete a character after o command

I have never experience this behavior before.

I have the following code:

123456789
1 def get_login(realm, username, maysave):
2 global login_cnt
3 login_cnt = login_cnt + 1
4 if login_cnt > MAX_LOGINS:
5 raise LoginAttemptExceeded(
6 'Number of login attempts allowed value,{}'.fomrat(MAX_LOGINS))
7

Say I'm on line 6. If I press 'o', my cursor moves to line 7, col 8, right under the `'` character. Now if I press backspace it won't erase anything between col 1 and 7. The cursor won't even move. Does anybody know what is the issue and how I can fix it?

Any help is appreciated.

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