On November 15, 2019, Vanilla Forums discovered a vulnerability in their forum software that exposed their user records. They immediately deployed a fix and initiated password resets for potentially affected users.
Your 1Password data is entirely separate from your 1Password Support forum account.
Go to https://discussions.agilebits.com/entry/passwordrequest and reset your password.
If your forum password is the same as your Master Password, change your Master Password.
If you used your forum password anywhere else, change those other passwords. You can use Watchtower to identify reused passwords.