Thanks for reporting this! No there is no issue. Right now the progress tracker is just to help students remember how far along they are in a course but it is tracked with cookies so if you ever clear your browser history or delete your temp files, your progress will be reset on the site.
No worries though, no achievements on this site are linked directly to the progress tracker, so as you log in, contribute to classroom discussion and complete exams successfully you will continue earning points and achievements!