Why does this edition say 26" x 40" when its really 25" x 38.5". It really messed me up buying a frame.

1. because that is what Obama's website originally advertised the dimensions to be and no one has bothered to bring the discrepancy to our attention.

2. Never purchase a frame for anything without measuring on actual item in hand. Even standard 18"x24" prints have been known to have an extra 1/2" here or there and the dimensions of early prints range considerably.