I'm sure it happens, and what a bad bit of engineering that must be. I have a jack system which has independent controls for the rear jacks, but a common control for the front. I assume that there must be some sort of a manifold which equalizes the hydraulic pressure across the two front jacks, but I'm always concerned about it when I'm not on a relatively level surface. So far, so good, however, after almost four years and a lot of set-ups.
Jenn & Pete
2006 Crescendo 8356 purchased new
Cummins 330 ISC
Toad: 2015 Jeep GC Summit