Bug in the order of coins of the Cook Islands [solved]

Although the order is set according to "face value", the catalog starts with the 5 cents:



Then a normal order is followed till the end of page 10 (with 200 results per page). There, after the 3000 dollars coin, it starts all over again beginning with the 1 cents (1 tenes), 2 cents, 5 cents and so on till the 1000 dollars coins at page 14:



All the boxes that matter for the chronological order (currency boxes, face value boxes) are filled in properly. So I have absolutely no idea why the order is so messed up for the Cook Islands coins. Is there anyone who can explain this or is this a temporarily bug?

Also there are some other strange orders too. The normal order for these coins is first face value (since that's my choice) and afterwards it normally is date, KM# reference and if no KM# reference, alphabetical order of the coin name.



But as you can see in the picture above, the coin in the red rectangle is the last one of all the 2003 1 dollar coins although there are a lot of 2003 1 dollar coins with a higher KM# reference which are before this particular coin in stead of after this coin. And as you can see on the three coins before this one, there is no order in alphabetical order nor in N# reference.

It's all a mystery to me. But this way the chance of getting duplicate listings increases a lot.

N numbers are for some reason primary sorting no matter what we select. Either a bug or Numista robot enacted doomsday protocols.

Same with the U.K., Mexico, France and many others it shows gold and silver proofs before the non precious coins and are all over the place.

Seems to be fixed now, if you encounter it in the future, let us know.

Yes it seems that way. To avoid duplicate listings it's important to know how the coins are ordered in our catalog. I knew within the same date the priority order (for most countries) is the KM# reference. But in that case something is wrong with the two types in the red rectangle which should be much more forward in the ranking:



Most things happen for a reason so searching further it turns out the priority order within the same date is apparently one year types first (something I've never noticed in all those years) with KM# references first and then the coins without KM# reference. After these one year types the types with multiple year lines follow with the type with the oldest year line first and the type with the newest year line last:



I still haven't figured out in which order the types without a KM# reference are sorted. Certainly not by the N# reference as you can see in the picture below (look at the green rectangles). Normally the order is alphabetically for these types but that isn't correct here either otherwise the Aries coin would be before the Cancer coin (see red rectangles):



Anyone any idea? It can'be just random.

By the way, here are the first duplicate listings:
- https://en.numista.com/catalogue/pieces16278.html
- https://en.numista.com/catalogue/pieces74763.html

When sorting by face value, the following criteria are used, by order of priority:

• Issuing authority
  
• Currency
  
• Face value
  
• First date
  
• Last date
  
• First external reference
  
• Series name
  
• Commemorated event
  
• Title
  

In your last example, Cancer ranks before Aries because there is an extra space before the E of Elizabeth in the title.

I now made a title change request for that Cancer coin.