How do I modify the URL to a taxonomy term?
Please check if you have a URL Alias in the system for "/term1". 

It might be mostly the case of all your old Alias existing in the system not the new once. If you don't find the update URL alias under admin/config/search/path. Then it just a simple bulk regenerate (admin/config/search/path/update_bulk). 

Please ensure you have selected 


Taxonomy term
Update the URL alias for paths having an old URL alias (at Times you may want to use the option Regenerate URL aliases for all paths)