Images not showing up sometimes

If I am in edit mode all docs and images show up fine or if I go back and use the older posts arrow they show up but if I view or use the search function to view the post some images show up and others are a url, example of one below:

https://www.fanningfamilyhistory.com/wp-content/uploads/2011/07/%3Cstrong%3EJames%3C/strong%3E-%3Cstrong%3EEason%3C/strong%3E-%3Cstrong%3ECook%3C/strong%3E-the-Kurrajong-from-Dundee-to-Port-Jackson-1854.jpg

above this url is a blank small box and when I hold my mouse over it this code appears <stro alt=

When I click on these the image still doesn’t show up.
I am using WP 2010 and have the latest version installed.

I have deactivated these plugins: Fancybox for WP, and Lightbox 2 and Smush it but this made no difference.

My blog is https://www.fanningfamilyhistory.com

Any help much appreciated but please if it is too technical I won’t have a clue so if you could keep it simple as I only have a very basic understanding of code etc