Merit deduction on paystub?

We live in alberta Canada and I was recently going through my partners paystubs to help him calculate some things and I noticed a section under deductions that says “merit” it took a good chunk of his pay check and all I’m seeing online is that merit is actually a bonus pay for employees with good performance I’m super new to all of this and can’t seem to find anything that says this should actually be a deduction but rather a payment to him anybody ever heard of this?
Merit deduction on paystub?
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