Issues with rear wiper

[jsbihn]

Hey all,
For some reason my rear window wiper has found itself south of the equator.
I have no idea why, but it is just reating about an inch or two below the glass line.

I would take the arm and move it back to above the glass line, but after a few wipes it tends to fall back down again. Then if I move it up to a few inches above the glassline then it will stay they but only wipe in a small pattern.

The wiper work, just isnt staying in place or wiping the area properly.

Any ideas of the problem and the fix?