X2 on what Ret said. They can descend one at a time. Nothing's wrong except there's more friction on one part of the screw. Another thing you can do, if you want to see them both moving at the same time, is to clean and lube the transverse screw with a graphite or molybdenum lubricant.
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Wright and Penny
(with Fitz and Lizzie, the camping kitties)
Richmond, Va.
2010 Tundra 4X4 5.7L V8
2014 Rockwood 2604WS
Life is a cruel teacher. She gives the test first; the lesson then follows.
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