FB link refers to a BLOG-page not to my static STARTpage

Hello support team,

Everything ran smoothly now in my WP site, but weirdly enough, when I click on my website link IN facebook (I click the link to my site there), facebook refers to a page I didnt even know was active. I dont use any blog features on my site. The site that then shows up is actually the default BLOG page, not the static STARTpage I set.

In the WP settings area I did check:
STATIC PAGE
(not “latest postings”)
and then I put the following 2 options:
STARTPAGE – here I chose my specific startpage (that works fine – ONLY if I click the link via facebook it seems to screw up)
BLOG PAGES – I didnt set any specific site here

I first thought it might be a SEO plugin issue,
but when I turn the plugin off, the bug still remains. Maybe it is a quick fix for you guys, any help would be GREATLY appreciated.

Thank you!
Kathrin

If you want to check:

https://www.psychotherapie-km.com (works fine when typed in, I get to the “business template startpage)
If you go to my facebook site here: https://www.facebook.com/Psychotherapie-Wien-254708261864337 and click my website (on the right menu), you will see you get refered to a faulty blog-site (empty on bottom and with the blog menu to the bottom right)