Inger is correct.
Your problem is the content in the right hand table column. having said that, you have used 10 instances of the <h> tags before the images you are on about, that is way to excessive. Below the images you have again used way too many <h> tags, but surprisingly you have not used the most important one which is the <H1> heading.
Heading tags are used to define the headings in your page and you should use them as you would if you were writing a book or article and not to highlight text in your page.
This is interesting Jim. But isn't H1 the biggest tag, and doesn't it usually do huge text? I don't want that on the page, though maybe I could change the definitions. But should H1 always be at the top, even if it's smaller text than H2 for example?
These tags seem really confused at my site. A friend suggested making the informational text on the lower right, bigger and "less busy" but doing so seems to screw up other things. And some of the tags don't even appear to work, when I try to define them to make the text bigger.
OS Windows 10