Tabs vertical in stead of horizontal

Hi there,

I’m an enthousiastic user of your great plugin, but I guess the last update made my tabs turn into a vertical mode instead of horizontal. I cannot resolve this.

Hope you have an idea?

Cheers, Martin

URL: https://www.tenniskampenamsterdam.nl/tarieven

https://www.ads-software.com/plugins/olevmedia-shortcodes/