Same Email in group as a pending member

Leeni <leeniluvsgroups2@...>

There is this member whose email, lets say is - xxxxx@...  showing as a member in my group. She then applied to the group using the same email address xxxxx@...
So now that email is a pending member as well as a member already in the group.
How can a member be pending if they are already in the group using that email address? Shouldn't it be blocked from being added saying something like they are already a member in the group?
Perplexed, Leeni

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