MyBB Community Forums

Fresh install of MyBB and whenever a user trys to register (any) they get a message that says "Our systems detect that you may be a spammer and therefore you have been denied registration. If you feel this is a mistake, please contact the Administrator."

https://www.danksidecs.com/forums/member.php

Version 1.7.4

I can login to my administrator account but if I or anyone else tries to register an account it gives the message.

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Bump...

Are you using the StopForumSpam checker? See if their IPs are in the blacklist.
http://stopforumspam.com/

Yes, stopspam sometimes goes crazy like this.
If you want, you can disable stopspam check and enable hidden captcha and newest google NoCaptcha features instead.