Wrong sitename title after yoast install! Please help, its important!

Hello,

after the installing the yoast plugin, on every site a wrong sitename displayed in the google search.

Thats a big problem, cause the wrong title display two words that violated laws in my country! Please Help!

Before Yoast Plugin I use the All in One SEO and imported the values.

How I can change the sitename? The displays sitename is NOT the sitename that are use in my wordpress settings. What can I do?