I had a different model Heritage Glen for 2 years before trading it in. It had an island with 2 pendulum lights above it. The lights were attached to an oval wood plate that was screwed to the ceiling. I noticed the same thing. The front end of the fixture was no longer flush with the ceiling. Further inspection revealed that the front side was only screwed into the thin ceiling panel and had pulled loose. I fixed mine by putting a wall anchor into the ceiling because I couldn't find anything substantial to screw it to, just hollow ceiling on that end. The back however, was screwed into a stud. I traded the trailer in soon after my fix, so I can't say how well the repair held up.
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Jim and Danna
2017 Ford F-350 Super Duty King Ranch
with 6.7L Diesel
2016 Coachmen Chaparral 360IBL