Hi Angie,
It sounds like you have two (or more) apps connected to your lock which are conflicting with each other. One is adding while the other is deleting. If you click on the SmartApps tab on the device page on your Classic app it will show the apps which are connected and using the lock (for example LUM or RLA). There should only be one app connected to the app. Tap the other apps and uninstall them.
That should solve your add / delete loop you’re seeing in the activity tab.