not sure whether this is an API issue, or something to do with the way coordinates are stored.

If you look at this query, you'll see that for some of the pages coordinates are listed, for others they are not:

However, quite a few pages do have coordinates on the corresponding wikipedia page, e.g.

Any ideas what that might be?

(As an aside, just in case it's related: How do coordinates end up in Wikidata? I assume it's a bot? Presumably the bot uses the API? Some of the above pages have got coordinates on the page, but not in Wikidata...)

Thanks!

Bjoern