With Tag Groups Premium you are able to use the same tag in one or more groups. If you need to make sure that clicking on a tag in a tag cloud shows only those posts that use that tag only in that particular group where you clicked, you need to activate an additional filter.
The steps depend on whether you use a shortcode or a Gutenberg block.
In a shortcode, simply add the following parameter:
In a Gutenberg Block, turn on the option "Add filter to tags for multiple groups."
This additional filter only applies to tag clouds that differentiate between groups: Tabbed Tag Cloud, Accordion Tag Cloud, Table Tag Cloud and Shuffle Box