breadcrumb double when product in more categories

[EIF]

When a product is assigned to two categories, both categories are displayed in the breadcrumb.

For example:
Product A is placed in subcategory X an subcategory Y of category N.

I have a menu item to both subcategories. When I select the product to go to the product detail page, the breadcumb always shows this:
Home/Category N/Sub cat. X/Category N/Sub cat. Y/Product A.

How can I manage it to show only that subcategory where I go to the details page from?

I am using the latest joomla 2.5.11 and virtuemart 2.0.22a

[EIF]

When I delete the menu item and the corresponding category, and after that creating it again, sometimes the problem is solved, but sometimes it doesn't.
I don't get when it does and when it doesn't.

[EIF]

Does someone knows the cause and solution for this?
Thanks in advanced.