I was baking today and noticed what seemed like steam coming out the top of the oven door. Then I checked to make sure it was shut (it was) but only to a point. There is a gap on the sides that shows the door is not closing all the way in. Is this normal? I tried pushing it in further to see what would happen but it won't stay. There is almost a force keeping the door back. I hadn't noticed that much steam before. I was using convection mode.