That is the pressure indicator, although perhaps not the adjusting screw. If I'm seeing the photo correctly, you are at the edge of the range, and the binding housing moved back so that it lined up with the last scribe on the range when you closed it down in the boot. If the boot is pushing the binding back, it must be touching it.
Looks like you have a binding similar to my Tyrolia bindings and likely have to lift that tab on that binding to slide the heel fore and aft, lock it into one of several set positions. You may have it set at the most forward position, and that barely puts you in the range.
If it were my binding, I would say "in" is "in" and leave it at that. I would ski that binding as is if there were not other more forward position, or if the next position moved you all the way to the other end of the range (not likley). It looks good to go.