OK - we are making some progress..
You can not reliably measure 2 speakers at the same time. Next step, please measure the left Sierra-2 speaker, run full range with no subwoofer and all processing / EQ turned off. Once you have this measurement, connect the LX speaker in the exact same position and take the measurement.
Once this is completed, please do the same for the right speaker.
Again, just one speaker at a time, no sub, no EQ, no DSP at all, full range.
Thanks!