I knew those were the modal values from the information you provided. The ancestral values aren't necessarily the same, but it's likely.

I see no evidence 'for' an NPE; those matches aren't very close. You should probably just wait for more people to test. In fact, you may want to identify and recruit more testers. It also depends on the rarity of your surname. If you had lots of perfect matches to people with a different surname, then I'd start to wonder about an NPE.