Chapter 9 Pensions Example 1

Hi,
The example
Aston made the following gross amount of contributions into his pension scheme in earlier tax years:
2021/22 £62,000
2022/23 £30,000
2023/24 £25,000
Aston has an annual salary of £120,000.
The answer in the lecture is

AA for 2324 40,000
Any unused 21/22 0
Any unused 22/23 10,000
Any unused 23/24 15,000
Total 65,000

Would the answer not be £50,000? As the AA for 23/24 would be £40,000 and the £10,000 b/fwd from 22/23. Wouldn’t the £15,000 for 23/24 be a double count?