If the Default Field Configuration or any other Field Configuration is copied via the Copy link under Operations and is then edited both the copied and the original field configuration show these changes instead of just the copied one.

To re-produce on s.a.c:
1. Copy the Default Field Configuration
2. Configure the copied Field Config by adding the Default Screen to field Time in Status
3. Click on View All Field Configurations
4. Click on Configure for the Default Field Configuration

Results
The Default Field Configuration has the change made the copied Field Configuration

Notes

• I also tried this for the Recruitment Field Config.
• If the Default Field Configuration is then changed back to its original state then these changes are also shown in the copied Field Configuration