In Kadesh: this is added to distinguish this miscarriage of Moses from that of the people in Rephidim, Exodus 17:7.
Related Commentaries of Numbers 27:14
Numbers 27:14
14 For ye rebelled against my commandment in the desert of Zin, in the strife of the congregation, to sanctify me at the water before their eyes: that is the water of Meribah in Kadesh in the wilderness of Zin.