Anything that was on the outside of the slides will end up on the inside of your coach, so make sure you wipe off any moisture prior to bringing them in. I carry a telescoping ladder to check the top of the slide, rain can stay up there for a while, then move forward and splash on the back of your head while leaving the campground (do not ask how I know, just part of the learning curve!). Sounds like you had a small amount of moisture dripping off the slide, and it continued to drip once inside. I have experienced moisture on the inside of windows, too, usually from using heaters that cause condensation. Dehumidifiers can help greatly with this problem. Hope this helps, watch out for the rain water puddled on the top of the slides. . .