bizarre permalinks problem in sub-domains on multisite

Just noticed a really bizarre issue -- content created on sub-domains is being listed in various places as originating on the main domain. So lets use this as a random example:

That's a post. Shows up on the site fine. However, various links don't use the sub-domain. For instance, in the All Posts list, the view link shows:
Same for the slug and the View Post button while editing.

Have tried multiple attempts to reset permalinks and purge the cache, but nothing helps.

Happening on numerous sub-domains.

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