I wll give them i try later when i am at home.
At this point i have deinstalled it completly.
BUT i have this behavior also without ServerDefaultPage and i don't really check why.
Without ServerDefaultPage it takes the first vHost (Domain) in the config.
But still:
https://noexists.domain.tld OR https://noexists.domain2.tld OR https://noexists.domain3.tld end on the same customer. (last added and not the first vHost)
As i said befor, i think the problem is on another end, SNI? because i don't own multiple IP for each cert.
Maybe the Project Director @Nuxwin know something more about this behavior?
Thanks for supporting.