Guest and Registered User groups not in group list

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Hello all,

As title states, the guest and registered users groups do not show up in the groups list.
I have tried adding them but then error message says that these groups exist!? Attachments show what I mean...

It means that users aren't being added to the registered users group upon registration and I can't manually add them to that group as it isn't in the list!

Hope anyone can offer some wisdom...

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