DKIM Body Hash Did Not Verify

I have configured DKIM as suggested somewhere in the forums where I set the key path, selector and Sign. The message is signed but it seems it is modified when received. I get the header from the received message and I analyze it on mxtoolbox.com and I get a message for DKIM verification:
Body Hash Did Not Verify

How can I correct this?

I also notice in the headers, that the second header for Received-SPF is blank. Can that be somehow fixed with some settings in the Admin console?

Content-Type: multipart/alternative;
boundary="===axigen=0792768043307448601372907576783211498299=axigen==="
Received-SPF:
X-AXIGEN-SPF-Result: Ok
X-AXIGEN-DK-Result: Ok
DomainKey-Status: good

Hello,

We have found that DKIM verification at mxtoolbox.com is buggy and reported back to them (in case you are interested our report have on their side ticket ID: PVS-VLHTM-867)

Our advice is to test DKIM signature with other similar online tools like:

HTH,
Ioan

Thanks for the reply. That would make sense. I did test with the mail-tester.com and that works.