In German and English the formatting of the columns fits, in Spanish not. [one_half padding=\"20px 20px 20px\"] [/one_half] is unfortunately mi tangezeigt and thus not formatted
Welcome to PickPlugins.
First, make sure you have the latest version of Accordion installed. Currently, the latest version is 2.2.70.
Then when you're editing your Accordion - under General, there is an option called Enable shortcode. Make sure the value is 'yes'.
Also, please check the shortcode you're using is valid. I can see a trailing slash on your shortcode.