I can remember my USAF maintenance days and aircraft hydraulic cylinders bleeding all over the ramp after sitting for days in the winter weather without having been cycled regularly. After a few cycles, they would stop leaking. The worst thing for a hydraulic system is cold weather and inactivity. Clean up the fluid spots, cycle the jacks a few times and then let it sit for a day or so and see if the leaks persist.
I had one jack with a bad leak, the jack pad filled with fluid so I had the jack replaced under warranty. Since then, things have remained dry/normal, the desired condition as described by Ray,IN.
'07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X
Blue Ox, Aventa
US Gear UBS