<...> is probably intended as </...>

Cause:

A tag without cumulative effect is been applied twice to HTML text. It is useless and probably unintentional.

Example:

Here is a sample with <em> (emphasis). 2 emphasis tags have the same effect than one.

Good<em>hello<em> world</em></em>
Good<em>hello world</em>

Solution:

Remove the second tag.

References: