I've written a post for consolidating book recommendations, and the links don't have hidden urls. These are links which were cut and pasted from a comment-- the formatting worked there.
Posting (including to my drafts) mysteriously doubles the spaces between the words in one of my link texts, but not the others. I tried taking that link out in case it was making the whole thing weird, but it didn't help.
I've tried using the pop-up menu for links that's available for writing posts, but that didn't change the results.
What might be wrong with the formatting?
I don't know what's wrong, but a peek at the raw HTML editor (there's a button for it in the toolbar) might give a hint.
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