You just need two different books to complete the set
I'm sure. It's probably a "P" and "D" mint State Quarter Album as already mentioned.
Now, if it's a "D" only mint book...(meaning only one hole for each state quarter)...........even as bad as Littleton stuff might be
.....that would be a "dumb" mistake by any Company !....Sometimes there are "exta" holes too...for "spare" coins.
Sell it to somebody and get a Whitman !.....