Multiple services of mopidy

i searched the forum and the web, but everything i found was not helpful.
i am trying to run multiple instances of mopidy on one server. therefore i duplicated /etc/init.d/mopidy and changed everything in there referring to “mopidy” except the binary - each “service” has its own config-file and own directories (mopidyRoom1, mopidyRoom2).
The problem is, that starting of both instances is working, but as soon as I stop one instance, all mopidy-instances are stopped.
btw i found out that no pid-files are generated. is this normal?