Unable to delete snapshots

Across multiple projects, everytime I delete a group of snapshots, upon project reopen they re-appear. 
I have tried the following: 

1. Duplicating said projects
2. Renaming duplicated projects from step 1
3. Deleting Renamed-Duplicated Projects from steps 1 & 2 and trying again. 
4. Step 3 failed.
5. Time to hard clear the cache. 
6. Repeating Steps 1, 2 & 3 in Safari (sigh...)
7. No joy. 
8. Repeating Steps 1 & 2 in incognito mode in Chrome
9. Sighs, makes a cuppa tea’ 
10. My tea helped - I’m going to create a ‘new project’, named ‘new-project’, and new snapshots. 
11. Close ‘new-project’. Re-open ‘new-project’ and delete snapshots.
12. Close ‘new-project’. Open for a third time - and the deleted snapshots are back to haunt me. I now can’t help but feel this a personal vendetta.  
13. Console log. It’s NextJS - shouldn’t be difficult. Nothing apparent other than UI feeback.

Please advise.