My daughter wants to post a book, but every time she enters the isbn, she gets a different book.   It's by the same author, but it's a different title and cover. Should she just manually enter all the info as in "post withoust an isbn" or should she contact tptb?

both, I would also try using the isbn other places to see if the other book comes up there too.

She should post without ISBN.  Many publishers 'reuse' ISBNs and if the book she has does not match then she can't use it or she'll get RWAP by the person who requests it.  She can probably grab the actual book data/cover picture from amazon so she doesn't have to retype all the synopsis, etc.

But, first check inside the book as well to make sure there's not another ISBN somewhere else.  Sometimes the binding has a different ISBN than the contents due to formating changes.

Adrienne, what's the title and the ISBN# of the book your daughter is trying to post?

I don't know.  She isn't home. 

There are a number of children's series where the whole set of books gets one ISBN number.  So the first one posted ends up with the number.  The rest need to get posted without a number.