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Only a few bass peaks reach that decibel level.
The 75dB at the listening position is set (when testing full range) with band limited pink noise using a low cut of 500Hz and a high cut of 2000Hz. You have measured from 0-20000Hz. The system has no way of knowing what the level is outside its bandpass, so there can often be a difference with the actual measurement. It isn't an issue.

Second questions relates to the high frequency roll off starting around 6 kHz. This is where my tweeter crosses over. Is that a measurement problem,
If you're using a generic cal file, this may cause a difference.
You should also measure your tweeter near field (<12") with a horizontal on-axis setup to establish whether the room is having an effect.

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