If you were parked on a significant slope, that can happen. It is not the preferred scenario, but is "normal" for a site that is sloped. We carry a circular bubble level and check for excess slope before using the jacks. And, we carry some drive-on blocks (wood 2x10s) for those occasions where we don't get a fairly level site.
Your auto level should dump the air from the suspension before starting to level. Sometimes, the air bags don't get fully dumped before the jacks deploy, however. There is a "Manual Dump" button on your HWH panel and you can use it before starting the Auto-Level cycle.
If you are staying for a while in that site, you might try using Auto Store to retract the jacks and then use Manual Dump to be sure the air bags are empty before trying Auto Level again.
My suspicion is that you are on a slope and need to either relocate on the site (or to another, more level site), or drive the low wheels onto some blocks to level things up before re-leveling.
TJ