Your image does not show for me. But I can imagine the situation well - I had an Apex 2011-2016.
Have you tried to call Outfittermfg?
There was always some tension on the roof system, but not all that much.
Are you sure all attachment points are firmly attached to the roof and camper, and everything is straight? Your description sounds like what you see is only a symptom of something else. In which case it would be important to find the root cause.
2014 Ford F350 XLT 6.2 SCLB + 2017 Northstar Arrow