Hi @ForFood, the reason it may be showing different on the site hosted in Webflow, is that when a site is hosted in Webflow, we minify the html. In an exported site, we leave all the white space in the exported files, so the site is easy to modify and read the HTML and css etc. If you have this problem on your exported site, you can try to minify the entire contents of the page you are having the issue with, and minify all the html using this tool below:
Then save the resulting minified html to the original html file, and re-upload to your server and test to see, that might fix the issue for you as well. The extra white space may have caused the tabs to collapse.
Cheers, Dave