I have problems when I want to delete a custom fields does not work.
I figured out the html code and found that the link to the delete button has a #. It does not do anything when I want to delete a custom fields
I hope you are well today and thank you for your question.
Please make sure that you are using below latest version of the theme on your site.
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This can be due to plugin conflict on your site so please try temporary deactivating all plugins except Unyson plugin and WpBakery page builder plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any.
In the meanwhile, you can achieve this by using the classic editor as described in the below pages.