Steps to reproduce:
- Open a page in VE
- Change something
- Click on "Save changes"
- Click on "Review your changes"
- Click on "Visual"
- Click on "Resume editing"
- Don't change anything
- Repeat steps 3 through 5 (scroll down if necessary)
The diffs are duplicated depending on how many times you go back and forth without changing anything.
A single diff should have been shown.