[Plugin: Cyclone Slider] Grey lines around images…?

HI there.

I have been implementing the cyclone slider into my website for a while and noticed that two of my projects seem to have a thin grey line going around the image…whereas other projects just have the edge of the image.

Anybody know how I can get rid of the thin grey line?
Take a look here….https://cbloomdesign.com/?portfolio=zoogos