So ive had a book on my wishlist and it popped up last week. i ordered it and it just sat there for a few days and then vanished. its now popped up again and its still just sitting there. is it a glitch or somthing?

It sounds like the sender failed to follow through on the order and it was cancelled by the system and they have now reposted.  However, that isn't necessarily the case, it may be a new sender.  Since you were #1 on the WL when they failed to mail, you were returned to the #1 slot and now have been re-offered the book.  I would go ahead and accept the wishlist offer.

Welcome to PBS Adam!  What Mary said

We can hope that the book timed out due to weather or Internet issues, rather than a member who does not plan to mail the book.

PBS will count how often we have orders time out or roll over. But they realize that real life happens.