Why do Class C's always leak in the front upper bunk area?

Our 2008 Jayco Greyhawk 31SS had a fiberglass front cap with 2 side windows. We never had a leak up front. We did have a leak in the rear by the ladder but repaired it right away. Some new 5th wheels have front windows in their front living floor plans and we had a neighbor who had a leak at the front window seam. Constant vigilance and inspection is vital to prevent leaks.