Printer model is Stamps.com ProLabel II Select ( ONYX ProLabel II Select)
Uninstall the printer driver + restart the computer
If the printer has been printing incorrectly, Re-calibrate the Printer:
Power on the printer and load your labels. Press and hold the feed button for 6-8 seconds until the light flashes or the printer clicks and feeds a few labels (1-2 Stamps) and Test printing
If the printer continues to skip labels or misalign, the media sensor may be dirty.
Turn off the printer, open it, and clean the sensor with a lint-free cloth or cotton swab dipped in isopropyl alcohol and test printing
If Printer kept printing in a wrong size and off to side
Follow the on screen instructions and keep adjusting the printing settings:
keep the portrait, scale at 90 % on the reprint.