Clicking 'Back' on report edit page keep changes in report cached object (until cache is expired).
Steps to reproduce:
1. Create a new report and Save
2. Click on new report to edit
3. Make some changes, generate report and click Back (twice) up to report list page
4. Click on new report again, to edit
5. Report will show the changes cancelled on the previous action (3). Object will only be refreshed after cache expires.