Fòram na Gàidhlig

I think I spotted a couple of 'mistakes' in the wild recently, or there's some use of the genitive I'm not familiar with.

"Am Beairt"
http://lanntair.com/events/event/am-bea ... sharmanka/

Can't see why that's using the genitive, wrong form of article too — should it not be "A' Bheart"?

And this one:
"Bùtha Scalpaigh"


Again, can't see why that's genitive. "Bùth Scalpaigh" surely?

Or if either of those are actually correct, why is that?

The i in beairt could just be a spelling mistake - no idea why it's masculine though.

Bùtha seems to be a dialectal variation.