I ran a survey and have 316 full responses and 317 total surveys completed.

Can someone explain to me what the difference between these two concepts is?
What might be the reason that one completed survey is not interpreted as a full response? It is also not listed as an incomplete response, i.e. when I download the full list of full and incomplete responses the respective ID is not in there. I can only see said ID in the "Display participants" table (although it is not in the downloadable csv). However, the "View response details" Action is missing for this ID. Nevertheless, it is marked as Completed and has 0 uses left.

Thanks in advance for help,
Zirys

This can happen if someone remove the reponse done by the user.