Hey there Lee Sachs,
Thanks for reaching out to the Apple Support Communities.
To get started, since noticing the issue have you tried restarting your iPhone? If not, while this may seem like a simple step, it can often help with resolving some unexpected issues like this. Give that a try with the steps shown here: Restart your iPhone - Apple Support
How to restart your iPhone X, 11, 12, 13, or later
1. Press and hold either volume button and the side button until the power-off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.
If the issue persists after restarting your iPhone, try removing and recreating the alarm to see if that's able to have any affect on the issue.
Keep us updated on the results.
Best regards.