The first thing I want to mention is that the images are veeeery big 3mb and larger…This is very bad for the user loading time. Consider making them smaller in size. Maybe around 200/250 kb
I see the problem you are talking about
One way to solve this is adding the images as a background and play with min. height. If you still want to use real images, you can put a div > the image inside > add a class to the images .slider-images > add little css code to the head of your site > play with the min. height
The css code
Other way is making the slider height 100%. Now the height is 300px. Try making the slider 100% and tell me what you think.