Hi Kinma. It is possible you have a condensation issue. When it is cold and rainy out and you have the heat on with lots of people that might have some we clothes on, you will most likely get some condensation. The heat will just increase the humidity in the pop up and it will condense on the cool walls.
The trick is to crack the bunk end flaps a bit if you can. I always leave my screen door cracked at the top a couple inches. This is under the awning and you have no problems with rain coming in.
2006 HW256 (previous pup)
2013 Chevy Tahoe
Equalizer WDH 1000#