Bread crumbs wrong on many pages

I note that all breadcrumbs are wrong on my site, some resulting in 404 page
I don’t recall ever turning them on
I don’t have any plugins for it
I can’t find any reference to them in my theme
But here are 2 examples of what I am getting
Note that I place the “/” in it. The copy and paste did not contain it

Home / Stamps / Scott # 21 thru 30 / Scott # 1 thru 10

The following should not be in the bread crumb
“/ Stamps / Scott # 21 thru 30”
Scott # 21 thru 30 is actually another page

All the rest look like:
Home / Stamps / Scott # 11 thru 20
Should not contain “Stamps” , but otherwise correct

I cannot find any reference to “Stamps” in any other place EXCEPT the breadcrumbs

Thanks

The page I need help with: [log in to see the link]