I have the Flagstaff version of your trailer and that is the way mine works. When I picked it up my dealer had been testing it and checked with Forest River before he released it to me and they confirmed that it is normal.
Also, and my dealer is not convinced but there have been no problems, when I bring mine in, if I bring it in 100%, there is a small amount of light that can be seen through the upper corner. He has me backing the slide back out ever so slightly until the light disappears and the slide is tight against the body of the trailer. He also tested this prior to releasing the trailer and told me if it ever leaks to return it to him for further review with Forest River. Thus far there have been no leaks even through hurricane spawned rains.
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