When we're putting the roof down, we've noticed that back of the roof closes a whole lot easier than the front. The back two latches are easy to do, and the front has to be pushed down a smidge before the latch will reach. What could be causing this? Besides the obvious things like making sure the canvas is tucked neatly and that there's nothing on the inside bumping up against the roof, what other things should we be reviewing? Is there something mechanical in nature that we should check? Thanks.