How is the Schedule B of the 941 populated?

The first 8 weeks of Q4 2020 are correct, the last 6 weeks are wildly off.

I've spoken with support both online and over the phone and they said there is some fix in the works, but they don't have any way to help me. The solution they gave me was to just use the tax liability forms and edit the schedule B where applicable, but I just don't understand how they can be so wildly off. 

Week

Tax Liability Report Auto-Populate Schedule B
9 3199.45 5714.11
10 2167.47 3084.56
11 2343.89 4326.61
12 3539.50 5453.60
13 3893.21 9000.13
14 2100.79 3025.67

How are they getting these numbers and how can they be so far off?

Should add, there is nothing to report for 5ai or 5aii.