After changing (and then changing back) my sorting method in the tweaks from library->alphabetical and the author_sort_copy_method from invert to copy.
I can't actually remember if I had this problem before or if I unintentionally broke it when I did

.
The problem I'm having however is that when I'm sorting my series (after inverting all the changed I did to default settings), My list looks like the following when using Authors/Series sort
Code:
Author1 - B Series
Author1 - Q Series
Author1 & Author 2 - A Series
this is not really a problem for me as long as an entire series has multiple but the same authors.
The problems is when there is a single series containing multiple authors ex.
Code:
Author1 - A Series (01) - title
Author1 - A Series (03) - title
Author1 - A Series (05) - title
Author1 - Q Series
Author1 & Author2 - A Series (02) - title
Author1 & Author3 - A Series (04) - title
My question / wish is that there was a way to use the tweak:
'author_sort_copy_method' to only copy the first author from 'author' to author_sort, whatever how many authors it actually contains. (using the & as a breaker).