OK, I see…
The Street was completed by an Activity that no longer exists. So when it’s trying to display the date that it was completed (stored on the Activity record), it can’t & it falls back to “manually”.
Right now I’m leaving the data for completed/progressed Street calculation if the Activity is deleted. I did this on purpose, worrying that people would be surprised to see their progress decreased if they deleted an Activity. I’m not sure that was the correct decision, though.
I’ll have to think about this one!