Always left aligned [Solved]

I sometimes use Mediabox to let visitors to play video o audio files. It works.
But I notice that the parent element (text or image, the one that has to be clicked) is always aligned to the left, even if I set it centered. In the editor it appears centered (correctly), but on the public page it is aligned to left.
If I delete the rel=lightbox parameter, it appears centered.
It seems to be a issue of Joomla 5, since with my old site in Joomla 3 it works perfectly. Or is it a matter of Mediabox?
Does anybody have an idea?

Hi
I have never seen that before, please give me the url of the page so that I can check the problem
CEd

www.marcofioretti.it/istituzionali/l-azienda-marco-fioretti
The Mediabox element is Guarda il video.
The attached image shows the correct alignment in the JCE editor.
Thank you!

I see the alignment on the paragraph, but the mediabox link is not in it
you can try to add this css rule in your page
the problem seems related to a bad closing tag on a conditional content

L'articolo è in costruzione. Torna qui tra qualche giorno!!</p>

CEd

Thank you: your workaround works fine.
Here is the code for the conditional content: It sounds to me correct.
Anyway, the problem arises even if no conditional content rule is defined.
Now I'm going to check it more thoroughly. Neither the title nor the description are shown.

I don't know how the condition works, but in your source code if you search for your text you will see the error

Anyway, the problem arises even if no conditional content rule is defined.

then please give me the url of an example so that I can check the other situation