You don't say what brand of levelers you have, but assuming they are HWH.
Do your springs have tapered or square ends? HWH came out with stronger springs to help the problem you describe. The stronger springs have tapered ends.
In the meantime, try wiping down the shaft of the problem jack with WD-40, then dry it off thoroughly before trying to retract. The WD-40 is meant as more of a cleaner than a lubricant. The shafts don't need lubrication. The part up inside the cylinder is completely surrounded by oil.
The other thing that can happen is the O-ring at the top of the shaft can get twisted or the shaft can get bent, which adds too much resistance for the springs to overcome to return the jack. The jack can be rebuilt to replace a twisted O-ring, but it will probably have to be replaced if the shaft is bent.
I think rebuilt jacks are available from HWH, or a local hydraulic shop (the kind that services hydraulic cylinders for construction or farm equipment) may be able to do it.
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