This doubling up of code can also be caused when importing a procedure into an application if you are using a global template that inserts code into local procedures.
If this is the case you can edit the TXA file before importing into your application and remove the template addition.
If you look through the TXA for the procedure you will see sections that start with [ADDITION], look for any occurrence of the help template and remove them from the TXA, save and then import.
Mark