Problem with Linking when Products are in more then one Category

[earlybird]

Joomla 2.5
VirtueMart 2.0.20b

I have a problem with Products which are in 2 or more categories.
The Problem is if you are in a productcategory (f.e. http://parempilahja.fi/fi/vanhemmille)
then all Links are correct (f.e. http://parempilahja.fi/fi/vanhemmille/jalkapallo-detail)
but if were once on this category (f.e. http://parempilahja.fi/fi/opettajalle)
and navigate to another category which contains partly the same Products
The Links to each Product should now be (f.e. http://parempilahja.fi/fi/opettajalle/jalkapallo-detail)
But it does not change and the links are still whith the old category.
If i clear the cookies and go to (f.e. http://parempilahja.fi/fi/opettajalle)
the links are ok again untill i navigate to another category.

Can anyone help me please it`s pretty urgent cause the page is online.

[jenkinhill]

That VirtueMart version is more than a year old (and known to have critical security issues). ISTR that a fix for category tree was introduced around VM2.0.24 so you would be advised to update (test on a backup copy of the site).   http://forum.virtuemart.net/index.php?topic=118683.0

Current VM version is 2.6 (requires minimum of PHP5.3.10 on server).