Here is a list of things to consider when trying to figure out why your printer is not printing correctly:

1. Check the printer settings to make sure the correct paper tray has been selected.
2. Ensure the paper tray has been correctly loaded.
3. Check if the paper tray is level and all paper guides have been set properly.
4. Make sure the printer isn’t out of paper.
5. Clean the printer rollers and paper sensors to make sure of correct functioning.
6. Remove any debris that may be blocking the paper tray from loading correctly.
7. Try restarting the printer to see if any temporary malfunctions can be removed.