Not just off but unplug and if that doesn't resolve matters, also remove it's drivers too if you can.. Then use the Step Input Keyboard built into Logic and see if you get the same issue.
I'm pretty certain this is a errant/not fully Lion compatible driver/midi controller related issue but I won't say that 100% until several other tests have been done.
Also, the screenshots as requested earlier, are vital for anyone here to be able to properly troubleshoot and help resolve this issue so please, post them up!
Thanks for the assistance, i was able to fix it...It was the midi data. I happened to import and old midi file from a different source and this weird fader lock at 6db was written in the midi data. I retranscribed the midi notes into a different track and replaced the imported data, and that removed the fader shifting.