Hello,
Image for that block is used as the background image with background-size – cover. This is the default WPBakery element and script calculates the min-height for the image block 250px and does not change it for the mobile device, the image covers 250px height and crop the sides of the picture. To avoid it I have added the custom class for the element http://prntscr.com/ke6fbm and added custom CSS to make block height smaller for the mobile device http://prntscr.com/ke6fi4 to show the whole image http://prntscr.com/ke66i9
Please,