After upgrade to ver.9 processes stuck for server QBM_PDBQueueProcess_Mnt

Hello everyone 

in ver 8.1.5 we had 2 job services, then we migrated to ver.9 and new hardware (web box, job service boxes, database box) and noticed something strange in JobQueueInfo: some auto-generated processes were assigned to an executing job service which we don't have, thus they stuck in the queue with status TRUE and never get executed.



Process name - Created by QBMDBQueueProcess

Process step - Execute SQL

SQLStmt - exec QBM_PTableStatistics '<some table name>', '<some guid>'

Executing service - QBM_PDBQueueProcess_Mnt

Well, the executing service name QBM_PDBQueueProcess_Mnt looks like something DBQueue-related, but definitely we don't have such job service.

How to prevent the processes be assigned to executing service QBM_PDBQueueProcess_Mnt? And what to do with the processes which already were assigned to it?