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It sounds like you have a kick down HWH system. I would suggest you start with cleaning and lubricating the jack pivot points and the small piston that pushes the jack down. Inspect and compare that all parts like springs and cables are present on the jack in question to the others. You can go here HWH Information Page
for more help.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7