Blog opens in wrong category

Hello,

I have your blog installed on a website.
Under the category "Blog" i have some subcategories.
You can see it here: http://bubblesnbites.nl/bubble-board/blog

When I open an blog-item here, I want to keep the parent category 'Blog' active, but the item opens in the blogcategory 'Recepten'. I think this has something to do with my SEO settings, but I can't find the right setting.

Here is a blog that is under the category 'blog' but opens under 'Recepten':
http://bubblesnbites.nl/bubble-board/recepten/entry/bits/bubbles-n-bites-op-weinreis-nach-wien

Thanks for helping!
Geert