If you have an awning or want to add an awning, they typically move the latch to the back on that corner. And may move the forward latch further forward to allow room for the awning or for awning prep (if you might add one later). If you don't plan to add an awning, it will usually not have the latch on the back.
I don't have an awning on full time but went ahead and ordered mine with the latches moved so I can add one later...