Rubber COATED plates are generally made to be used by recreational lifters, those that dont deadlift.
They will bench, curl, some may even squat, but the plates NEVER touch the ground.
Subjecting them to deadlifts and cleans, movements unheard of in commercial gyms, may cause the plates to suffer abnormal pain and stress.
Contact Adrian Oli, he may be able to help.
I'm not suggesting you have mistreated the plates by the way, but your stronger than the average recreational lifter, and doing very heavy DB rows may have been whats caused the problem