Slider imagies is zoomed in

So i have no link to the website but my problem is simple.

I’m trying to have a slider with 2 pictures on it. i added them to 2 posts and set the pictures as “Featured Imagie” However it crops the picture no matter what size i give it to whatever it is, its incredibly annoying and i cannot find what dimensions are the correct nor anything in functions.php

I’d like to have the slider to show the pictures in their correct dimensions.