There was a problem with templates

Is there such a problem. Add this template:

<div class="my_class">
    <div class="header">Title here</div>
    <div class="content">Content here</div>
</div>

Is added correctly. But when starting to edit content in a div class="content" when you push "Enter", add another div class="content", and it is necessary to appear paragraph. How to solve this problem?

Thanks