Hello Cantclearstorage,
Let's use the steps below to restart your iPhone, if you haven't already done so since making those changes:
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.
You can also find those steps in this resource: Restart your iPhone - Apple Support Sometimes a restart can help address odd behaviors.
Additionally, does that still persist if you temporarily disable Low Power Mode? Use Low Power Mode to save battery life on your iPhone or iPad - Apple Support
Let us know, and we'll keep moving forward from there.