Diagnosis
The ink level indicators on these are notoriously slow and sometimes just plain stubborn. They're not measuring the physical tanks; they're estimating based on page counts and a software reset that sometimes doesn't trigger.
How to Fix It
You need to manually reset the ink levels. On the printer's control panel, press the home button, navigate to Settings, then select 'Reset Ink Levels'. Confirm the reset for the colors showing empty. The printer will beep and the status should update to full within a minute.
If That Didn't Work
If the reset option is grayed out or doesn't stick, the printer might need a deeper reset. Unplug it from power for a full 2-3 minutes. While it's off, press and hold the power button for 30 seconds (to drain any residual charge). Then plug it back in and turn it on normally.
Heads Up
Ignoring the low ink warning is fine for printing. The printer will keep working until the physical tanks are actually dry. Just keep an eye on the actual ink in the bottles, not the screen.