This sounds ... unlikely.
Please find a device that you are certain does not have a keylogger installed, then change your password again, to something unguessable. And preferably longer than 13 characters; that is still pretty short.
I can't remember how this site's password changing system works, but if it requires an email confirmation, you could also change the email conected to this account. Make a new address with a name that isn't connected to you, and a strong password.
Of course, this is an old and not terribly secure forum, so if you are dealing with a professional, this won't be enough. But I highly doubt you are.
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