Bug in the breadcrumbs

Hi, I have a problem with the breadcrumbs in the theme Kahuna.

Because I use 2 blogpages ([Bewegen] & [Gezonde Leefstijl]) and I use a plugin (The Post Grid) for my blogpages (I want a different layout for those pages then the Kahuna theme), the breadcrumbs are not working at the blogpages.

The blogpages (of the plugin The Post Grid) are build using the category option. In that way, it is possible to make 2 different blogpages.

But now, when you are clicking at a blog, the breadcrumbs is: Home>Blog page>Blog. That looks allright. But the Blog page (at the breadcrumb) is not the blogpage of the plugin The Post Grid, but it suddenly uses automatically the Kahuna theme Category blog…… :
– Result (wrong breadcrumb): Homepage/category/blog-page/
– It should be (right breadcrumb): Homepage/blog-page/
How can this problem be solved???

(Are some screenshots helpfull to better understand this issue?)