Leaderboard probleem

I created a leaderboard in a test game for my students, It works fine, but in the second exam I created another leaderboard for it, I noticed that scores are shown in both exams, how is that? They are two different games.
Something else, the test works fine on itch.io, But something went wrong on my webpage which I paste the test Embed code in it.

Is that a big problem? Or was it no problem so nobody replied?