Variable not displaying

I'm having an issue with a variable displaying. The variable is a value where the learner has to click a number of boxes for the variable to kick and and when it does a marker changes from Hidden to normal. Clicking the marker then takes them to the test. 

It works sometimes and not others. 

It displays occasionally when previewing . 

It is currently displaying when viewed on Chrome but not Firefox or IE11.

Please help!

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