Why doesn't my script pick up a variable from the Variable Manager?

I have a csv file imported into my project under the file variable. I'm trying to access a certain column from that data sheet in the JavaScript I have written. For the most part, it is able to pick up values from some columns, but some columns it doesn't pick up. I made sure I'm typing the column name right and I do see the column under Variable Manager when I go to that specific variable.