I ve two different option for one blueprint file. because of that firstly I set to new variable with box trigger to blueprint file and variable become first version. But after that first version doesnt work.
Secondly I duplicated this blueprint file and i changed what i want variable. These two blueprint has different placement and different only one variable. I did not change first version. I changed only second copied blueprint. but only second version worked. the other one didn’t work. Please help me 
Please give us a screenshot of your blueprint. Then we can see what is going on.