3 of 3 grammar corrections, capitalization

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's phone. But he is also not able to remove my name and add it again. Other group members cannot see my name in the group member list. So I don't know exactly what the real problem is. I have uninstalled WhatsApp and re-installed it, but 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?