Joomla Expandable Module

Hello, Wolfgang.

Thanks for your post.

It can be some jQuery or Bootstrap issue on your site, maybe it is loaded multiple times. Please, try to use jQuery Easy plugin (free) for fix it. I can check your site if you provide me a link.

It looks like Bootstrap library loaded twice on your site, maybe it is hard coded in your current site template's code, because it works fine with protostar template:
shiftin.life/component/content/article/2...2&template=protostar

Please, try to download new module version. I've added new parameter Load Bootstrap. Try to disable it.

In this case, the problem comes from another place. So, you need to fix it in the files, or use some plugin for fix twice loaded Bootstrap (it is possible with paid version of jQuery Easy).

Also, here an article with described way to fix it with ReReplacer extension:
www.joomlashack.com/blog/joomla/duplicated-bootstrap/
Also, maybe it is possible to use Joomcar Site Faster plugin for replace/remove some code from the site.