There already are several Structured Data modules available for Zen Cart, but with this one you do not need to edit core files. Instead the data is generated through Json files
Hi,
on first check it appears you have the jscripts for the index page in
/modules/index/
instead of
/pages/index/
so they do not get used/loaded on the index page.
And, as far as I understand only one of these three jscript files should be used, as applicable to the site content.
So maybe all three should require manual enabling: I prefixed them with "hidden_..."