After applying/removing a route map to the ISIS accept I-SID using commands such as below:
(router-vrf)#no isis accept i-sid <i-sid no.> route-map
(router-vrf)#isis accept i-sid <i-sid no.> route-map
The route entries could either become unresolved or point to an incorrect next-hop IP address and incorrect next-hop VRF. The affected route entries happen when there are originally multiple routes to the same destination learned from another BEB node and from the same node in a different VRF.