A Friend Was In My Town And I Dug A Hole When She Ran By And Fell In It Has This Happened To Anyone Else?

It's an issue of lag. If your player, for any reason, is standing on a hole, they will fall in.

You can do it yourself, by digging a hole next to a rock, then sit on the rock, and try to stand up where the hole is. Your character will fall in, just like a pitfall.