HSA Plan Rate Calculation is not working properly

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Hi Experts,

We have an HSA plan with an HSA_Standard_Rate where we have defined the Calculation Method as Flat Amount Processing Source as Process each pay period by default.

Now when an employee chooses the HSA plan and enters the Flat Amount, the Rate is showing Flat Amount/26 (for e.g. Flat Amount entered is 900, the system shows the Rate as 900/26 = 34.62 ). Considering 26 is the number of the pay period.

But the moment I submit my enrollments, the Rate value is getting changed to 40, i.e. 900/25 = 36. 

Any idea what could be an issue?

Thank you in advance.

Best,