Mainstage 3.2.3 is copying audio files on save as
I am on a Macbook Pro running OSX 10.10.3. When I save as, it is copying audio files and continuously taking up more hard drive space. The files seem to be related to a stock Mainstage patch, as they have "Steinway" in the file name. I have already consolidated the project so all EXS files and samples are in the same folder, but the problem presists. Any idea how I can stop this from occurring?
MacBook Pro (Retina, 15-inch, Mid 2015), OS X Yosemite (10.10.3)