Not sure in your case, but I get a lot of invites to Professional gatherings and in many cases I get two. Thats because they have me down in two different segments of their client list.
I have tried to explain it in the past that there is only one me, but it still occurs. Its probably 2 invites in your case. Check the spelling of your name in both cases (shortened names, etc) or addresses (street vis PO Box), or something else like that. In all cases that its happened to me, its actually an additional invite and the expectation is that a second person will turn up to an empty chair, etc.
If thats the case for you, then 'who you going to invite?'
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