Sort by Reference failure - German Notgeld

When I sort My Coins - German Notgeld by reference, there seems to be no consistent order.  Neither Funck, Men, nor N# are listed in any numerical order--it is really wild and all over the place.

How is it currently sorted?  Can we perhaps list by all items with a Funck number listed first, then all items with a Menzel number listed next, etc?

That is not a bug but a question for a referee.

The first ref. is generally FUNCK, than MENZEL. 

could you give an expl?

It would be nice if it were possible to sort by city, so that they are sorted alphabetically from Aachen up to Zwiesel.

Now it is always whatever option you choose, first sorted by Province and then the city.