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@EmLeigh, Welcome to the HP Support Community!
 
Have you tried printing different photos and check if the issue persists?
 
Update the software on iOS
Click here to know how.
 
Upgrade the Sprocket firmware

Make sure the Sprocket is on and your mobile device is connected to the Internet.

On your mobile device, open the HP sprocket app.

Tap the Menu icon , and then tap sprocket.

Tap Manage Printers, make sure your Sprocket is selected, and then tap Printer Settings.

Under the Status section, locate Battery.

If the battery charge is 25% or higher, continue with these steps.

If the battery charge is 24% or lower, charge the battery for at least 30 minutes, and then continue with these steps.

In Printer Settings, look for a firmware upgrade.

If a firmware upgrade displays, tap Get Firmware Upgrade, and then follow the on-screen prompts to complete the update.

If a firmware upgrade option does not display, the firmware is up-to-date.

Clean the Sprocket paper path rollers
Perform step 3 and step 4 from this document.
 
Let me know how this goes.
 
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