Mid-pay period hire showing incorrect base rate and quantity on the payslip

Summary:

When an employee at our institution is hired mid-pay period, on their payslip, it's doubling the quantity and displaying half the base rate on the payslip.

Content (required):

Example for a two week period. Employee works normally works 40 hours at $25 per hour. They are hired mid-pay period and only worked one week out of the two weeks, their first paycheck for employment. Their payslip for that check is reflecting a quantity of 80 hours and a base rate of $12.50. The math comes out the same but it's confusing to employees. We are using a custom payslip but are others experiencing this? Is this the expected results if using the delivered payslip?