Glitch- replacing an image and other information getting deleted.

Hey guys!
So I’m having an issue on my contact page. I have a current graphic (“live at heritage ranch” – liveatHR_headerimg1.png) placed on the lower right side of the page. Im trying to replace the image with a different graphic (“life at heritage ranch” – lifeatHR_img.png). BUT, whenever I do anything at all with that specific “Image Media Element” box (replace it with a different image or even just delete it), it automatically deletes ALL of the names with links throughout the entire page. I did have the same exact issue occurring on the home page, and ended up having to retype all the content that it randomly deleted, but before I have to do that again with this page, I figured I should ask the experts first! :) Thank you for any help/advice you may have!!
-Tory
Here is the login info: