Why is my Pension Input less than last year?

Page 10 of your Benefit Statement shows the actual calculation for your Pension Input, it is the difference between your pension accrued to 5 April 2023 increased in line with the Consumer Price Index (CPI) and your accrued pension as at 5 April 2024.

As CPI for the 2023/24 tax year was 10.1% this means that your Pension Input for the year may well be lower than previous years.