Default Change_Request Flow designer [Change - Normal - Assess]

[SATHIGARI ANURA]

Change - Normal - Assess [Flow Designer - Default]

This flow is not working. To edit the flow, i deactivated it, created the copy of that flow and captured it in update set. Later I backed out the copy flow which i captured in update set. Now, when i am trying to reactivate the original flow. its not working. But again when when i made a copy of same flow and activated it. it is working.

Please suggest me a solution on how to reactivate the original flow which should be working.