Had the same problem
I had the same problem here with an 89 CRX. Hatch was leaking right onto my passenger rear speaker.
I ended up replacing the hatch because my back window shattered (unrelated incident). When I put the new hatch on, I used silicone sealant on the bolts to the body and it stopped all the leaking.
Try pulling hatch off and using a rubber sealant on the 4 mounting bolts and hinge. It might help resolve the problem.
Good luck
Java