I'm at step 13 in the course. I haven't noticed this behavior before but I don't think I've changed the deletion code from the earlier step, so I may just not have been aware of the issue.

When swiping a list item row in the list, the wrong row and item are deleted.

Please note in the screenshot that the index offset is the 0th item, and the current item in the onDelete function is item 7 in the list at index 1. However, the wrong-row deletion is not one off each time, it seems to be that random rows are deleted for a given swipe-to-delete action.

Any ideas? Has anyone else seen this?

I think Paul do address this in a later video, but it to do with the sort order

let allItems = project.projectItems(using: sortOrder)

Yep, thanks for your answer, you're right. Paul introduces the bug fix in the next lesson.