One option is to use the Editor debugging functions and set breakpoints. Set them and remove them down your code as necessary until you locate the area of the code where the number starts to display.
A similar approach is to insert a break or return statement at a particular point in your code and then see if the number displays. (Those statements will stop code execution at that line.) If the number displays, the statement producing it is before the return you inserted. I suggest you add something like
to your return statement so it will be easier to find later. If the number didn't display before that return, comment that return out (so you know where it was), and do the same thing several lines further down in your code. Keep doing this until you locate the area where the number starts to display. This will at least narrow your search. Then comment out particular lines of code until you locate the one that's displaying the number.
This approach is kludgy beyond description, but sometimes it's the only way to solve such problems.
Additional idea: if you can't find a line in your code that you know is displaying the number, check the code's dependencies with depfun. The original author of the code could have written a function, called by the code you have, that's displaying the number.