having issue with images being too big

I have inserted some images for the following page and the images are being “blown up” in size.

https://mymedigapconsultant.com/original-medicare-part-a-b-c-and-part-d/

Any suggestions as how to fix it. Have tried to resize in WYSIWYG editor and they look correct. After publishing, the content it way too big. Any help or advice would be greatly appreciated.
R