that is very odd, i dont understand that at all.
no, this should not be the cause, the script will look through al disks looking for a matching top level folder named after --media-shares, which in your case is 'Server' (case sensitive), you do have a share called 'Server' right?.
run the script as follows:-
/tmp/no_ransom.sh --lock-files 'no' --media-shares 'Server' --debug 'yes'
post the output, this will definitely unset any attributes set by this script.