First issue:
At the backend of TabGK5 once tab is added I cannot edit it settings. Basically all drop-downs are inactive. So, there's no way to edit tab settings once new tab was added and settings saved.
Second issue:
Including NSP into a tab. Click on scroll (pagination) at NSP module causes tab area come up white with no content at all. Perhaps there's something wrong with settings - I don't know. In my humble opinion there's a bug.
You may found the issue here: http://wesolalapka.pl/miejscowosci/katowice
Tab: Opinie... there are dots for pagination. Each time click on dot makes content to disappear.