>> ... maybe your character pitch is OK as it is, and there is an extra space that has moved the data in the check boxes on the right side too far to the right ...
I (tentatively) agree: the two left-most "X" characters just about line up in the boxes, the two right-most ones (ostensibly on the same line) don't.
Can you post a sample of your data file (with any sensitive details redacted (replaced by "*" characters).