Spitfire Solo Cello and Violin Audio Glitches

I recently purchased solo cello and violin. I noticed when I use a slider(s) to control dynamics I get a scratchy click type sound. No matter what I do or how I play I can't get rid of it. You can also hear it on the recorded track. While watching the demo video I also heard it once. Does anyone else have this problem? This doesn't happen on my other spitfire string programs. Is there a way to avoid this from happening?

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