Bad pathway in vm30.14

[Studio 42]

Hi,
In product with multiple category
i have this pathway
HOME|CAT1| SUBCAT1|CAT2|SUBCAT2|PRODUCT
CAT1 AND CAT2 are two complet different categories !
The real pathway should be
HOME|CAT2|SUBCAT2|PRODUCT
And the CAT1 generated link is http://mysite.fr/index.php/CAT1/manufacturer/?categorylayout=0&showcategory=1&showproducts=1&productsublayout=0 but should be http://mysite.fr/index.php/CAT1/

CAT1 is a menu link to a VM category
I think last router and category system have some bugs and i have many problem with site using multiple categories that i had not in old releases.
Joomla 3.5 + VM 3.0.14