Hi Sameer
Does that mean you did have that box selected? If so the WF is moving down new config path. You might need to review what your conditions are for determine paths, etc
If some are working and others are not, are you you using a BRFplus decision table or similar and have not catered for all events?
If you say all is working and it's just this group I would recommend you check your config. However, if you can create a new delete request and it processes successfully then maybe cancel the one not working and reprocess it?