Mine did the same thing. (MCD Dual), if you have tried to tighten the tabs on the end of the shade, and can't tighten anymore, then roll your shade up by hand and try to wrap the shade around the roller by looping it around until it is at the top. I think mine came loose traveling and when in the full up position, unwound a few turns to where you can't raise it any further with the spring. Re-winding it around the roller fixed it.
Mark & Debra Wood, Las Colinas, TX.
2013 Entegra Aspire 42RBQ
2023 Jeep Wrangler Sahara 4XE
2013 Thor Challenger 37DT - Sold