HTML Progress will not save

Currently going through the HTML CSS course. I completed the first portion and every time I sign back in it shows current lessons incomplete. I created a new account and started over and it still is having an issue saving progress. Certain ones will submit and save but when I look @ the curriculum page it does not show I completed those sections. Any idea what may be going on?

you say that, you try by creating another account and still facing problem then try to clear your browser catche or use another browser

Thanks, I have cleared cache and the issue is still occurring. I used safari and google chrome and it will not allow me to complete more then up to number 10 on the curriculum.