Mine did that as well. I don't mind the BR's and DVD's being integrated but dividing them by genre was just stupid. It's easier to find a title when everything is alphabetized together instead of being left up to someone's interpretation of the genre it should go in. One step forward, two steps back.
They do this to keep customers looking for something specific in the department longer hoping they will buy something else and to entice others who have something catch their eye stop into the labryinth.
Actual result is 4x the amount of time to find what you're looking for leading to anger and frustration. It doesn't work because of the way it creates a fixated tunnel vision to find exactly what you're looking for - and you absolutely will not stop until you find it, or give up on the deal and leave.
Walmart has been doing this with their electronics for years.