Problem with horizontal scrolling only when apply a dropshadow

I have a problem with the horizontal scroll of my prototype, it works perfect only if I don’t apply the dropshadow to the cards. I can’t figure out why, can anyone help me?

No dropshadow

With dropshadow

As you can see, the link with dropshadow, horizontal scroll works strange the initial position has a space and also the final…

thank you

Anyone can help me?