Register button wrong URL

Can you check if you have a template override in your site for the vertical file? It would be in the following location:
/templates/<YOUR_TEMPLATE>/html/mod_sclogin/joomlaLogin_vertical.php

If that file exists, compare it to the /modules/mod_sclogin/tmpl/joomlaLogin_vertical.php file and either integrate the changes you made to your override or remove your override altogether.

My guess is that your override is still using the older code.

I hope that helps, but if you need anything else, please let me know.

Thanks,
Alex

Glad to hear we could help you resolve your issue.

I didn't know this functionality in Joomla to overwrite the original file from the folder using the html folder of the template. Could you explain me how it works?

Template overrides are a built-in feature of Joomla. They allow you (the owner of the site) or template developer to create different layout files for modules or components by moving the files from a module's /tmpl or a component's /views/xyz/tmpl/ directory to the template's /html directory. As long as the right directory structure is used, Joomla will automatically use those overrides instead of the original layout files in the component or module.

Just put the html folder in the template or need to make any calls in the template?

Just create the files and the overrides will work instead of the module or component

How these files got there without me manually place?

No clue. Either you did it and don't remember, another developer did it, or they were included in your template to have special stylings for the SCLogin module.

Since they were placed there, why they were not placed again (overwrite) after the update?

Template overrides are meant to be persistent and remain even if you upgrade a module or component. The idea is that you can make modifications without worrying that they'll be overwritten when you upgrade an extension. Of course, it also means you need to verify that any changes in the new layout files with the extensions are incorporated into your override.

I hope that helps explain, but if you need anything else, just let me know.

Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks,
Alex