Chaotic taxonomy search fields, hard to make sense of them

After indexing nodes with en/fr languages, I go to /admin/settings/apachesolr/query-fields to set the language-specific fields.

Most make sense, except the taxonomy part is very chaotic. Below a list of my select box titles:

(in the exact order as I see them)

tm_node: 
English - : 
English - : 
English - English - Taxonomy term names only from the ManufacturerID vocabulary: 
English - : 
English - : 
English - Taxonomy term names only from the Categories vocabulary: 
English - Taxonomy term names only from the Stores vocabulary: 
English - Taxonomy term names only from the ManufacturerID vocabulary: 
English - Taxonomy term names only from the Brands vocabulary: 
English - Taxonomy term names only from the EAN_UPC vocabulary: 
English - Taxonomy term names only from the SKU vocabulary: 
French - : 
French - : 
French - French - Taxonomy term names only from the Categories vocabulary: 
French - : 
French - French - Taxonomy term names only from the Brands vocabulary: 
French - Taxonomy term names only from the Categories vocabulary: 

etc.

The empty titles like "French - :" and double titles like "French - French -" (?) make it very hard to understand.