Problem with Dynamic Text

Well, I’ve had this problem with a couple of different files. Whenever I contiuously change variables that define Dynamic Text using ActionScript, the text begins to appear with square characters in front of it. The character looks like this: [] except wider. Has anyone else had this problem before? Any ideas how to fix it?

Note: This doesn’t happen on the computer that I made the Flash file on, just every other computer I’ve tried it on.