Order of links in 'See Also' section changing unexpectedly

I made this change the other day to this coin and the other three in the series, just to sort them alphabetically, which were approved by al-Bakuvi overnight (thank you 🙌). However, upon viewing each page, the links have rearranged themselves? 

The Yellow-billed kingfisher coin is now at the top on all of the other three coin pages. I initially thought this to be because of the number at the end of their URLs, but this probably isn't the case.

Regards.

The will be sorted in THIS order.
 

I don't know the sequence of terms entries are ordered by but when sorting by denomination it seems denomination, year, series, event.

1 Dollar; 2013; Australian Waterbirds; Australian Kingfisher
1 Dollar; 2013; Australian Waterbirds; Australian Shelduck

1 Dollar; 2013; Australian Waterbirds; Australian Songbirds

1 Dollar; 2013; Australian Waterbirds; Striated Pardalote

This was done I believe to keep coins in a series as close together as possible which is not always possible when you should keep titles as short and usefull as possible.

Ahhhhh, thank you very much!