Images have different sizes in Siteorigin Image Row

Hi,

I am not a professional and I am facing difficulties of having the images in the same size in a row: http://hawasafaga.com/catamaran/?preview_id=553&preview_nonce=42ddfbd8bb&_thumbnail_id=-1&preview=true (courses and freeriders). I tried to re-size the image to the same size, but it is still smaller.
Would be grateful for help! Thanks, Julie