Still having difficulties with saving results

Hi everybody. Still having difficulties with saving results. Can’t save result for Certificate projetc “Tribute page” (not saying about training projects). I have tried to save it for three times and could see the mark “done” checked but the next day it was unchecked and unsaved.
How to deal with this? Keep on trying to save?
Frankly saying it’s very annoing.

once you complete the tests and you get the modal you must press the button in the modal to submit