Hello and Welcome. My name is Michael.
There are several thing you should try.
- Do a Deep Cleaning Cycle on your printer through the HP built in Software on your printer or through Windows.
- Do an alignment which is also part of the HP built in Software in the printer or through Windows.
- If that fails, do a full Factory Reset on the printer.
- If possible use a different type and manufacturer photo paper to see if causes the same issues as with the 5x7.
Please let me know the results.