WYSIWYG Editor Blues

When your CMS Just decides to change things. I know it's deterministic. Has to be a reason, but not sure what it is

Trying to stick in my source

<p><em>This was also posted to
<a href="https://indieweb.xyz/en/bloggingresearch” class="u-syndication">/en/bloggingresearch</a>.</em></p>

and it comes out like this:

 <p><em>This was also posted to <a href="https://indieweb.xyz/en/bloggingresearch&rdquo;%20class=">/en/bloggingresearch</a>.</em></p>