Can't get the static home page to be found on a subsite

The site is here:

I am using Sites Pro and Blog Templates. That blog is "my template". I can't find why but Any page I create and link in the settings as static page get a 404 not found on the home page of the site. I've never seen this before.

I have 1 or 2 other issues to fix but, let's start with this one.

Thanks for your help.