I wrote a support ticket with MSI support. Lets see what they have to say about it. I can not believe that it is a hardware defect of any sort. Just some BIOS setting or mess up on MSIs part. Also wrote to AMD about it, in case it has something to do with AGESA (do not believe this, but still possible).Both those kits will do 3800c14 at or below 1.5V
I have a friend on another discord that RMA'ed his Unify-X because of this problem you're reporting.
I would suggest doing the same.