If you are seeing a difference between "Ad Network Installs" in Campaign Center vs "Ad Network Installs" in Creative Center, this is due to Campaign Action Conversions that are configured in your Google Ad account. You could be tracking conversion actions as clicks or some other in-app actions.
Campaign Center’s Ad Network Installs are based on Campaign/Country Conversions.
Creative Center’s Ad Network Installs are from Asset Conversions
Example of Campaign Center:
Example of Creative Center:
To modify your conversions in Google, please kindly edit the app assets and keep "app_install". Follow the instructions here to modify the conversions.