Box 16/17 on T4 is Employee's CPP/QPP contributions.
Box 16A/17A is Employee's second CPP/QPP contribution.
Technically, both amount should be on the same T4. If the last version of your T4 on your CRA My Account is not with box 16/17 and box 16A/17A on the same slip, we suggest you to contact CRA to see if you can combine both T4s together to have only 1 but with all the amount reflecting your 2024 year.
Here is the link to contact CRA
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