DKIM Signature Body Hash not verifying

I am having trouble with the DKIM signature body hash not verifying. MX Toolbox is reporting this problem when I ping test send an email to the delivery check tool. When I go to the Email Deliverability for the domain, it shows the DKIM record as valid. I am on cPanel 78.0.17 and my DNS is hosted on the same server as Exim. Is there a problem with the way Exim is signing? or the way MXToolbox is validating? Or is there somewhere else I should be looking?