Lost progress, home page from some time ago came back?

My homepage and courses i was working on ( but eventually gave up on to focus on main courses ) some time ago came back? And when that happened all my main course progress  was back to where it was some time ago.

I also went to the progress page in the 'my account section' and it says I haven't done anything for a month.

I keep using 'some time ago' because I do not remember the exact date.