Hi Arpit,
Application servers can be configured for specific purpose, like background/ dialog/update/spool/message/gateway, only, or a combination of these. Dispatcher assigns the job , to any of the app servers, depending upon the type of activity involved.
Could you explain, how app server is setup to perform job distribution. And, if so, contact BASIS team, if job is not getting distributed.
Could you schedule a job, in back-end, in one app server, and try to see if the job appears in any other app server. i do not think it will run.
Could you ask 'background' to be removed from CI, to the BASIS team, and then check if, your NWBC job, is picking up other app server
Regards
Plaban