Ditto … It’s a bit strange
FWIW When I had a little look into this I also noticed that a lot of them appeared to be from links shared in posts within the forum itself, rather than anything I’d shared on another site.
I managed a tentative repro by long-pressing on an eligible link in an onsite post on my iphone (eg https://meta.discourse.org/t/has-anything-changed-on-what-qualifies-for-the-nice-share-badge/385296/23?u=jammydodger) and the ‘preview’ did create an incoming link record with no domain info attached. I was wondering if this could be similar to how bot traffic is currently accessing the site and possibly bypassing the host check?
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Mine is more of a slow dribble, but still a little vexing. 
To maybe push this further out on a limb… could this be a ‘null’ thing, where the bots/pseudo visits aren’t generating a host value and ‘null’ doesn’t equal the site and so it passes the host test?