Exactly, weight ranges and board sizes aren't an exact science, they are just a guideline. Personally all the boards recommended for my weight range seem way too big and bulky for me and I prefer much smaller boards. For my weight range a 5'9 and above is typically recommended. However I ride best and prefer boards that are sub 5'0, my favorite to date being a 4'0 and I just picked up a 3'9" over the winter I have yet to try. It's a pretty drastic difference from what is recommended, but it is what feels best for me to ride.
My advice, ride as many different boards and sizes as you can and go with what feels best to you.