New to me today, new to slide outs and just got my unit home. Opened the sliders and the big one on the passenger is not opening fully. It has a 1 inch gap at the bottom froward part of the side. You can see light thru the opening. Don't remember seeing this gap upon our inspection. So, why did this happen? How do I to fix/adjust this issue? Tried moving it in some then back out...didn't help.