I have the same problem. Every other SPF or DKIM tools, besides Postmaster Tool, show as correct with no errors/issues. Logic is not present in Postmaster Tools results, at least in my case which seems to also be the case for Ching. Does anybody have a clue?
For instance, in https://mxtoolbox.com/ all checks for SPF, DKIN and DMARC show in green, meaning success.
Appreciate any clues from you guys, thanks