Thanks for the posts guys.
I am here right now with my audio guy and we are sorting through this stuff.
He is using a sound devices 442 sending line level.

I have the XL-H1 set to line level input with all attenuators off and in manual mode. I turn the dial up and once it reaches about -22 it wont go any higher, even though the nob is at about 3/4. If I turn the nob higher, it just sticks at about -22. All 3 of my XL-H1s are doing the same thing, so no broken camera here.

Also, when switched to auto line mode, it still sticks at -22

According to the SD442 manual, line output is "+4dbu nominal"

This is using XLR straight out of the SD and straight into the H1's
XLR in back?

If so, I wonder if the Sound Devices is pin 3 hot or
somehow the XLR cable is not wired correctly. Have
you tried another cable?

WHat happens when the H1 is set to mic level?