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I had the same problem with a content module. I solved it by writing the whole: <a href="#">link</a>.
In that way it didn't appear.
Now, I checked your problem on my site, and it appeared to me that when you write the address, instead of the whole html link, it appears on blank page.
So next time, instead of writing:
https://xoops.org/
write: <a href="https://xoops.org/">123456</a>
Good day and success,
Ron.(;