I replaced the group gasket because of a leak every time I pul a shot. When I did a test run, the presure moved the...

I replaced the group gasket because of a leak every time I pull a shot. When I did a test run, the pressure moved the portafilter and the new gasket leaks more than the old one. I opened the machine and tried again just in case I made a mistake and the same thing happened again. Any ideas or trouble shooting please.
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Mercedes , First did you get the correct group gasket, did you remove the old one completely and was it perfectly clean, did you put it in beveled side down? If you have a question contact us.
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