Google Scholar indexing PDF galley, not article landing page

Our journals are for the most part well represented in Google Scholar, but I noticed that it links the indexed articles from directly to the PDF galley, instead of to the article landing page. This is a minor problem, but I’m really curious to know why. The other journals on our server (the ones I checked, anyway) have both links in GS.

Perhaps it has something to do with the fact that Gränsløs aren’t using abstracts for their articles? That’s the only difference I’ve noticed so far. Does anyone have any ideas about this?