Image Cropping Issue

Hello there! I am having a problem cropping the images for the current header section on these pages. The images look really stretched and warped. I am editing someones website, so I have no clue how the previous designer made the pictures for the other headers fit. Any Advice?

Below are the links to the pages that I’ve inserted a picture for that doesn’t look right.

https://www.lachfinancial.com/history/
https://www.lachfinancial.com/our-services/
https://www.lachfinancial.com/philosophy/

Below is a link to the pages that have images in the header section that ACTUALLY fits. I want to know how to accomplish this.

https://www.lachfinancial.com/educationcenter/
https://www.lachfinancial.com/fee-only-adviser/