Paint delamination touchup, what am I doing wrong?

Dana67Dart said
Seems like paint it is not adhering to the OEM primer.

Seems like primer will stick to OEM primer, till the topcoat paint touched the primer in that location then it does the same thing. Like the topcoat is softening the primer but only above the OEM primer oem paint bare metal interface
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Maybe the stuff you are using isn't good (bad batch). There are binders in the paint that react with the underlying layer to adhere and maybe the paint you have is lacking them.

Or there is some sort of contamination on the body before you paint