The first thing I would check is to go to Admin, members, then click on the member row for yourself.? Check to see if somehow close to the bottom of the page you are set as OVERRIDE:? Moderated.? If so, then you have to check for not moderated and save.
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I do not know how that would happen if you are the group owner.
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IF that is not the case, maybe someone else here can make a suggestion as to what to check.
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When you initially go to the members listing, if you click on E-mail, it will list all alphabetically which will make it easier to find yourself.