Can't calibrate speaker volume

[Gary4USA]

I am new to REW, just got my umik-1 mic. I have got the speakers outputting and mic reading but when I do a volume calibration the SPL meter in REW won't go below 80, even when I have the house dead quite. And if get the speakers normal listening volume the sound meter go up to 100dB and auto shuts off. Picture attached is with dead quiet in the room. Is that normal? What am I doing wrong?

 

[John Mulcahy]

Select the WASAPI Exclusive version of the UMIK device (device name starting EXCL) and make sure the cal file for the UMIK is loaded. If that doesn't correct things attach screenshots of the Soundcard preferences and the Cal Files preferences.