The titanium plate always leaks at the third one

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The area of each plate is 015; 15 plates are to be installed. The material of the plates is titanium, while the gaskets are made of EPDM. The pressure applied is 20 kilograms, and the medium used is water. The testing is carried out at low temperatures. After installation, the pressure on the cold side is appropriate, but when the pressure on the hot side reaches 20 kilograms, the second seal on the third plate leaks. After replacing that third plate, testing is conducted again, and leakage still occurs on the same plate. Even when 30 plates are installed, the second seal on the third plate continues to leak. Upon reinstallation, whether pressure is applied first to the hot side or to the cold side, the pressure reaches 20 kilograms in both cases. When testing is done with the cold side first, the second seal on the third plate still leaks. After removing the leaking plate, it was found that the plate itself was not deformed, and the foot pads retained their normal elasticity. Please advise