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Thanks for your question.
That's quite odd.
The Home Office Identity and Passport Service are not perfect just like any other institution and they can make mistakes. The above is a mistake I believe. I would be slightly surprised if it prejudiced you when you were going through customs, perhaps they would take more time to examine the passport in detail - they are pretty high tech these days and verifying the passport will not be difficult.
That said, it is a mistake and I would go back to them initially writing to them and enclosing a copy of the passport and referring to your original application. Ask them to explain the renewal date or to ask you to give them your passport in order for a further amended passport to be issued.
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