“Unspecified currency” does not appear in the index of the list

When I search items, ordering by face value, and there are objects without currency, these are shown at the bottom of the list, but the index does not say that there are objects with unspecified currency.

For example: https://en.numista.com/catalogue/index.php?e=bresil&r=&st=95-83-201-203-204-205-85&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=&a=&dg=&i=&b=&m=&f=&t=&t2=&w=&mt=&u=&g=&se=&c=&wi=&sw=

The same happens when there are items with unspecified ruling authority. https://en.numista.com/forum/topic127637.html

The index does show when there are items with unspecified issuer. https://en.numista.com/catalogue/index.php?r=5+blank+cent&st=150&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=&a=&dg=&i=&b=&m=4&f=&t=&t2=&w=&mt=&u=&g=&se=&c=&wi=&sw=