Section doesn't get saved and need to do it all-over again!

Hi all,
I’m experiencing some problems with the savings of my courses done.
I haven’t been able to continuo my studies for a few weeks, now when I get back to my learning profile my last course hasn’t been properly saved.
This has already happened a few times already, the seems to be saved and then is not. Is someone else experiencing this kind of bugs?

It’a annoying to be loosing time to do the same things over and over again.
I usually save my coding but I can’t go and place it all in once to get the course done.
It bores me to have to go step-by-step again.

I hope someone would help me with that.
Thanks a lot!
Enrico