Your scheduled send with 'Send Recipient Time Zone' sent early.
When 'Send in Recipient Time Zone' is enabled for a send, our system will start the construction of the emails for the program based on the earliest send time. The remaining emails will be held by our server until the designated time for the intended recipient based on their time zone.
This will cause the Send Email activity to be recorded according the time that the email was handed off to the Mail Assembly Server for construction. For the emails that are being held until the appropriate time for the send, our reporting will mark them as Pending until they are either delivered or bounced by the recipient email server.