This is a bug in ADE where it incorrectly displays anchors as links. calibre used to explicitly workaround that bug, but it stopped doing that, as the workaround can break rendering in compliant epub renderers. You will have to apply the workaround manually.
Probably the following in extra css will do the trick
a { text-decoration: none; color: black; }
a[href] { text-decoration: underline; color: blue; }
or something along those lines, it's been a while since I touched ADE.
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