SGsAP IMSI DETACH INDICATION packet decoding problem

I am using Wireshark Version 1.8.7. In SGsAP IMSI DETACH INDICATION packet in IMSI detach from non-EPS service type IE the IEI and length is correct but the content is wrong.It says IMSI detach from EPS service type: UE initiated IMSI detach from EPS services (2),but it should be IMSI detach from Non EPS service type: Combined UE initiated IMSI detach from EPS and Non EPS services (2).

Please look into this.