The GPOADmin Watcher Service is a point in time monitoring solution to help to find changes to GPOs which occur outside of the GPOADmin Client. This means that everytime the interval is reached, a hash of the GPO is generated and is compared to the live object. If a difference is found, the GPOADmin Watcher Service typically detects and shows an unauthorized modification. The minor version is incremented in this case.
Consider the following scenario:
1. You edit a GPO (Version 1.0) outside of GPOADmin Client
2. The GPOADmin Watcher Service detects an unauthorized modification and increments the version to 1.1
3. You edit the GPO and change it to how it was configured before
In this scenario, the GPOADmin Watcher Service does not detect a change and will not increment the version number.