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If its a PS1 Multitap then there might be problems with swapping the different version of the equipment.
If its a PS2 Multitap, and all 3 have had problems, then its something wrong with your PS2 i would say. Something inside its not working right as it cant read your pads or the memory cards. Try the simple stuff, clean the sockets ect. If it still doesnt work, might be worth calling the Sony Helpline to see about getting it repaired/getting a new one.
Hope that helps.