Flow Desginer Run as different user not System

[BoHyun Jung]

I set Runas as System in Flow Designer, but it often runs as a different user.

[Flow Property]

[Execution]

Like above, sometimes it works as a System and sometimes it works as a different user. Help me to work as a System User only.

[MohitGupta21]

Please copy the flow and delete the existing flow. and attach the new flow to the catalog item.
this seems like a bug from ServiceNow which is not fixed yet. 
doing the same steps helped me fix this problem.