Quiz set in Storyline have a strange behavior in Articulate-Online : results can not be recorded sometimes

Hi!

We just created ten tests with Storyline. We have noticed strange behaviors with some of them. 

Many final results are not recorded in Articulate-Online while some are for the same quiz.

On one test, I completed it numerous times on my PC and each time I was opening it after, I was sent back to the same place I stopped once, nothing having been recorded in Articulate-Online. Then, I dit it on my Mac without problems. Some other tests I did on my PC have beed recorded just fine.  The PC browser we recommend is Google Chrome (V. 47 or later.)

Any idea on the problem and how to resolve it?

Many thanks!

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