Correct questions counter

I have a quiz, where in the bottom of each question slide there is used a variable which count if the question was correctly replied (please, see sample below).

But when I added a new question slide to the already existing quiz, exactly on this new slide this variable does not work.

Should be like this:

But on the new slide 'counter' is not working:

I double-checked everything, and all question slides have completely similar Triggers.

Please, advise...

Thank you

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