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Some groups are not visible in my whatsapp

I am not able to see some of the groups for which, I am a member. My name appears in the group admin phone. But he is also not able to remove my name and again add it. Other group members cannot see my name in the group member list. So don't know, exactly what is the real problem. I have uninstalled Whatsapp in my Phone and re-installed it. but still the problem remains the same.(Still i cannot see some of the groups in my phone). Can you please find some way to come out of this?