Thanks to you @ibp12. So, it’s confirmed it’s not just a matter of CSS, but the output of the shortcode is not printed at all.
Do other shortcodes work on the same page?
If not tested yet, can you try for example the following shortcode
[caption]Hello world![/caption]
That’s a shortcode added by the core. You should just see “Hello world!” on the page.
If that shortcode works, I will investigate deeper why it doesn’t work with the shortcode added by Oracle Cards.
If on the contrary, it also doesn’t work, I suggest you to check the settings of the plugin AIOSEO. I know that plugin does strange things with the shortcodes.
I would check the settings of AIOSEO in any case.
Maybe temporarily deactivate it to see if the issue is caused by a conflict with AIOSEO. If this is confirmed, we can focus on that direction.
Have a great day!
Jose