I just figured out the Expander button for your WL by reading the Tips for New Members Section.  But lets say I have 2 versions listed, and 1 comes up to be shipped to me, does the other version automatically get deleted from my list?  And can both versions be sent at the same time?

No. It is put on Hold. (Pink background) You have to manually un-hold books

That said, not all versions successfully link.  Please do check for the other versions.

Hold is great in this case. You keep your place in line, in case anything happens to the book that is coming.