Strange Image behaviour in slider

Hi, I have an Enfold theme site (see link).
On the home page, on the slider, slide 2, the first image on the left of the three portfolio images displays too large and overlaps the middle image. This does not happen on smaller browsers, just on larger ones when the slider is at its maximum width. If you stretch or contract your browser width on that slide, you will notice how that one image stretches and contracts with the browser window!
Please could you take a look and advise if there is anything I can do!
Many thanks in advance.
Peter