What’s the difference between line 22215 and 44800? Both say cpp overpayment, but the numbers are different?

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There are some differences between line 22215 vs line 44800. 

As per Canada Revenue Agency (CRA), line 22215 is used for claiming a deduction for the enhanced contributions on CPP and QPP pensionable earnings you contributed through your employment income.  

Line 44800 is used if you are not a resident of Quebec on Dec 31, 2020, and you contributed more to the CPP than you had to, claim the difference on this line. The CRA will refund the excess amount to you or use them to reduce your balance owing.