Tests unchecked

Does someone know why some tests even they are passed are not checked as done on the list?
By example -for:
explore-differences-between-the-var-and-let-keywords and
and are more examples.
Even I did many times correctly they were not checked as passed.
I hitted ( ctrl + enter) as it is write on the window to go further after passing the test.
Many thanks.

Clear your cache and reload or login again. Had the same issue once.

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I would not worry too much if you can’t get a couple of the lessons to mark as completed, since the only requirement to complete the course is the projects at the end. Trying to clear your cache, or restarting, or trying a different browser might work though!

Thank You, for advice.

I thought that matter also the lessons’ tests.
Thanks for Your response. :100:

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