I had my garage done years ago and I've never had that issue. I do have a strip that basically sits outside the garage when the door is closed and that part has started to turn dark over the years from the UV, however nothing inside the garage.
I just had the garage done with epoxy in new house we are moving to and they told me they use special UV epoxy now with a UV top coat also. They did say it's slightly cheaper if you get only UV top coat and not the epoxy. They had different names for each.
But yeah that doesn't seem normal for a professional epoxy. I have seen houses that claim to have epoxy floors but it's clearly just cheap paint with flakes in it.
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