If theses are Power Gear hydraulic, they use the hydraulic level in the reservoir to detect if the jacks are retracted. If the level is a little low, it thinks the jacks are still down.
With the jacks fully retracted, top off the reservoir with fluid. This is how I did it on mine.
https://www.1999southwind.com/flush-and-refill-leveler-hydraulic-system/
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