Coping stones on an angle

[ahdoubleyou]

Hello all. We've had some parapet wall coping stones replaced but the builders have laid them on an angle. Theyre once weathered, and the slope is increased by how they're set. Concern is there's very little overhang on the up-hill side, and it's going to mean water runs down the wall. Phot attached, and grateful for thoughts. Thanks.