heading shows html code

I have an issue with bold and italic in the header.
To be more specific:
I have an accordion with several accordion items in it.
Every accordion item has a heading and an embedded video (youtube) in it.
The first accordion item is fine in the heading.
But the second and so on gives this in the header:example: Name, <em><strong>profession</strong></em>, but only in combination with a video in it.
every heading after the first heading gives this sight.
I have found out that the video in the first acordion item causes the problem for the heading in the next accordion items

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