Hi Gigi,
Are you using owlcarousel in newsslider mode? Is it taking content from Joomla articles?
If yes, then you need to edit line 45 of /rt_topaz/particles/owlcarousel/newsslider-joomla.html.twig - this is the default code...
{% if particle.jintrotext == 'enabled' and item.introtext %}{{ item.introtext|e }}{% endif %}
The |e means that it will treat all content as text. To get it to use html you must change |e to |raw
If this resolves your problem then please edit your first post in this thread by adding [SOLVED] at the start of the title and click on the icon and select the 'tick' icon. This lets the moderators know that it can be moved to the solved section.
Thanks for your cooperation