A bit confusing for me where to ask support, but see this url
Confidential information:
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: the 4 tabs are horizontal
Now i change the color (this is an extension from breakdesign, custom filter for all) to another color. Then the 4 tabs are vertical. Sounds like a bug, but i don't know if its a bug in tabs & accordeon, or a bug extension from breakdesign.
It looks like you are using VirtueMart. It reloads the content via javascript.
The tabs will need to get re-initialized after the content is updated.
Ask the VM devs how to trigger this javascript upon update: