I have the OEM hard tonneau cover (PT954-35241) and installed it myself on my 24 OR 6' bed. It does lower the factory bed rails about 1/2-3/4" as bed rails are uninstalled and then hung on the tonneau cover aluminum mounting clamps.
Yep, happened to my 14" screen knob like maxx075 described^. I replaced it with this all aluminum one:
https://www.amazon.com/Wyckoff-Replacement-Compatible-Touchscreen-Accessories/dp/B0FSS67356