Featured Slider Image not displaying correctly

Please help, I've just bought this theme but the slider images are not displaying correctly on my site www.realitycoaching.co.uk. I have looked at the instructions, which states the image should be 1920x514 but the images, when displayed on my laptop, are always cut off on the right hand side. Also neither my phone or tablet can display the images correctly. So it looks like this theme is broken and I don't seem to be the only one experiencing issues. https://catchthemes.com/support-forum/topic/featured-slider-image-not-responsive/ I also own Adventurous pro and have had no issues with the slider images on this. How can I customize the slider image size so it is displayed correctly? Thanks