Hyperlinks copied from external sites show up in html format on my forum

[Aaron1981]

I copy a hyperlinked text like the one below to my forum:

As social scientists, psychologists aim to understand the behavior of individuals and groups. [3][4]
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On my forum, it shows up as this:

As social scientists, psychologists aim to understand the behavior of individuals and groups.<a href="https://en.wikipedia.org/wiki/Psychology#cite_note-Fernald-3"><span>[</span>3<span>]</span></a><a...
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Hyperlinks copied from external sites show up in html format on my forum

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