This is what you get as long the GPS is not yet locked. Maybe you have bad reception indoors, maybe your antenna cable is broken, maybe you have an active antenna, but supply is off, maybe......
You can get further data for satelltes in view and use, SNR, and other GPS status with plain GPS commands. Try
AT+CGNSPWR=1;+CGNSCMD=0,"$PMTK314,8,8,8,8,8,8,0,0,0,0,0,0,0,0,0,0,0*28";+CGNSTST=1;
Google for PMTK314 for the meaning of the various NMEA sentences you get returned.