There is a plunger type switch on each of jacks that is compressed when jack is retracted. It sounds like one of these is bad, missing or out of adjustment.
Don't know which leveling system you have. This happened on my old rig with the BigFoot system. It turned out that one of the feet had loosend up, so it was not pushing the clevis pin all the way up. A few turnd of the wrench on the bottom of the foot and all was well. Also, check to make sure the hydraulic fluid is up to the correct level, as low fluid can also cause this problem.
I had a similar problem with mine. The trick was to disconnect the wiring harness to the pump and reconnect it. That reset the system and any jacks that had gone down were retracted to the full up position. Apparently, some of the pin connections in the plug on the harness come loose and need to be reseated.
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