SupuS - there are two things to consider with your problem. Firstly, you only have 1 test product in the test category, and you have automatic redirects enabled, so rather than showing the category listings, it just shows the only product. That isn't a problem related to the SEO, but something to consider when testing. I'd recommend either setting up another product, or turn the redirect off.
The second is the fact that the link in the breadcrumb works, which is setup to go to the exact same category, as the category name. I would suggest you take a look at both links, and see if there is anyway that these two links differ, in terms of coding used to create them. It may be worth turning the SEO off and checking to see if there are any differences there before you go any further.
Absolute