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If you log in to Government Gateway you can check your PAYE tax code details here: https://www.tax.service.gov.uk/check-income-tax/detailed-income-tax-estimate
This will give you the breakdown.
HMRC might be doing that thing where they extrapolate figures across 12 months, assuming your situation will stay the same for the whole tax year.
That's normal, at least it was for me. Are you a higher rate tax payer, and have you recently submitted a self assessment where you declared your personal pension contributions?