Custom value returning expression instead of value

Hi, trying I'm simply trying to set and then sum to variables to change a container's y position. To test, I created text to also show the sum, but instead of adding the 2 numeric variables, it is returning the string "{var1} + {var2}". I don't know what I could be doing wrong... These expressions are listed on the Variables support page. 

I would love to figure this out, thank you!


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