Hi beensnj,
Thank you for posting in Apple Support Communities!
Does the same thing happen if your iPhone is connected to a wired charging cable to charge?
Is a Qi- certified charger being used? You can view a list of Qi-Certified Chargers here: Qi- certified chargers
Since noticing this, has your iPhone been restarted? Restarting our device can help when we are experiencing unexpected issues such as this one.
1. Press and hold either volume button and the side button until the power off slider appears.
2. Drag the slider and wait about 30 seconds.
3. Press and hold the side button until the Apple logo appears to power it back on. Once back on, test to see if this continues.
Check out: Restart your iPhone - Apple Support
You should also confirm that the latest iOS is currently installed on your iPhone: Update your iPhone or iPad - Apple Support.
If this continues, you'll want to reach out to Apple Support for further assistance. Depending on your region, you may be able to reach them here: Apple Support.
Take Care!