Usually, the "cloaked" version of an email address will look something like this:
Crazy, right? But Soapbox knows how to work with the browser to reassemble that into a sensible email address.
However, spambots don't! So, the email address remains hidden from them, and they can't vacuum it up and add it to their spam lists.
However, you can run into a problem if you add any formatting to the html code *inside* of the <a> tag.
For example, if you have something like this:
<a href="mailto:email@example.com"><strong>Ask GPTW</strong></a>.
So if that's what is happening to you, take a careful look at your html. You probably have something there either in or in-between the <a> tags that is causing the problem.
The correct way to format the above would be like this:
<strong><a href="mailto:firstname.lastname@example.org">Ask GPTW</a></strong>
With the <strong> tags *outside* of the <a> tag.