Another user, here. I offer these Captain Obvious ideas tentatively, because I realize you're very familiar with this stuff. If you click the HTML editor link that looks like </> at the bottom right corner of your RCE box, you might see some unexpected formatting code. I have sometimes inadvertently overridden text colors when I too-magnanimously swept my mouse, not realizing it until later. Typically, when I hit a hard return after copying a URL into an RCE box, that text turns blue and remains so for the published product for my students; but sometimes there's a lag when I have not-excellent WiFi connection on my end and it sorta "doesn't stick." When that happens, waiting a bit or saving and trying later helps. And . . . you've probably tried erasing a chunk of stuff and starting afresh already . . . but that sometimes that works for me when I'm out of other options. Hoping you figure this out & publish your solution if you do.
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