Ionic 4 reverts to old code after deploying to Android device via usb

I’m developing an Ionic 4 app. I plug in my phone to my mac and deploy via ionic cordova run android. It seems fine but after closing and re-opening the app a few times it reverts back to a previous implementation. So for example, I’ll add different elements and functionality but the app on my phone will revert back to a previous deployment that doesn’t have any of the new features I added. I read something similar in this forum that suggested the following:

    <variable name="UPDATE_METHOD" value="manual" />

I changed “background” to “manual” in the config.xml and I though that worked until I opened the app on my phone today and none of the new features were there.