I have a problem with the car coming into the floors and it starts to bounce at leveling speed, only in the up direction, it’s a twin post, 3 stage jack, no air in the jacks and filters in the valve are clean, it’s a Bucher valve LRV-1, any suggestions? Thanks

Sounds like typical stick slip. I would increase the up leveling speed slightly. If no luck there add some maxglide to the jacks. Your other options are repacking the jack. And worst case if the pistons are too polished and you can't get this to go away they may need resanded so there's a better film of oil between the packing lip and piston surface.

Agreed, but would add that this can also be caused by the packings. Best results with black Gorman packings.

Had a very similar issue. Used Maxton MaxGlide oil addative. Worked like a charm

Try pulling the springs off the buffers and doing a jack resync
FJR command. Sometimes the springs keep it from activating the check valves.

Anytime I've encountered this it was always a bad packing. Packing usually is rolling which causing the bounce. But agree with all other replies above.