Totally normal. That's the cool-down cycle. When the cooking timer ends, it beeps five times and shows OFF.
Fix: Nothing to fix. The fan icon stays on as it continues to run and cool down the unit. The fan will stop on its own shortly after another beep, about 20 seconds later.
If that didn't work: If you turned it off manually by holding the Power button for 3 seconds, the fan may also run for up to 20 seconds afterward. This is by design.
Exception: If you had the Keep Warm function activated, the unit beeps once after the main cycle and switches to 150°F for 30 minutes. In that case, the heating element is still on low.
Heads up: Always wait 30 minutes for the appliance to cool down fully before handling, cleaning, or storing. Accessible surfaces stay hot.