Multiple files in created JPL package

I have seen that in my built JPL package certain files appear twice or even three times. It seems to be only files in additional subfolders. In my case they are Font-Awesome files. Here is a screenshot of what 7zip shows me:


Is there anything I can do to prevent this? It doesn't seem to matter, but it enlarges the file unnecessarily.

For reference you can find a version of the JPL package here.

@tessus wrote about symlinks. But I don't know wether it is supported or not.

Strange, I'll take a look. Maybe the JPL builder keeps adding file to the archive if it's already there, so it's matter of deleting it before building.

I've also tried this. He's adding the files also to a newly created jpl package.