Wrong categorie on bloglink in mail with new blogitem

Hello,

I use on my website the option that users can subscripe to the blogs.
They get an email when I post a new blog. In this email, there is a link to the blogitem.

The strange thing is: This link shows the blogitem under a different category then the item is published in.

Is this something that can be set in the backend?
How do I get the blogitem shown under the right category?

Thanks in forward!

Geert