Sessions not getting saved as complete

Community Novice
I am having issues with one of my courses not saving my completed sessions as complete. For example, Module 1, sessions 2 and 3 to be exact, anytime I log out and back in, the system un-checks, or makes it appear I have NOT completed sessions 2 and 3 in Module 1, not allowing me to continue on with Module 2. 
  If I let session 2 and 3 play (again and again), I can move on to Module 2 and everything works just fine, until I log out again... then session 2 and 3 in Module 1 show they are incomplete again...
  Any thoughts? 
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