registrant entry in events

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We recently changed to NXT RE and have noticed a difference in registrants in events.  Some, not all, are duplicated.  It doesn't seem to matter if they are registered or not.  They have two entries and when updating one of them the other just stays the same.  See example below.  We of course did not enter them twice - they just appeared.  Does anyone know why this is happening and what can be done to prevent this.  Thanks
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