XenForo I can't block guests from posting

I

IcoHolic

Guest
Guests have become able to post on our forum. We have all the "General Permissions" set properly, but they can still post. However, I cannot replicate this phenomenon being a guest myself.

The posts come in bursts, so it's likely bot driven.

I know where my brain is going on this one, but any insight would be very appreciated.

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