A glitch

Why did this happened?

what do you mean ?

instead of actual rares in the Minimum Rare DNA section of the prize, there’s epics, seems like a simple visual glitch

Thats not a visual glitch. I saw my brother get that incubator and he got the same dose of Rex Dna (71-78)

Now the question is, does it give double the epic dna instead of epic & rare, depending on your situation i wouldn’t be complainimg about a little extra epic dna. But if its one of those cases where you need that exclusive rare dna then yes that is an annoying glitch