WEEKNUMBER formula not returning correct result


When I use the formula for WEEKNUMBER, my results are being offset by 1 week between Sunday and Monday.

Sunday, Sept. 12 = Week 36 (Correct)

Monday, Sept 13 = Week 37 (Incorrect)

I have checked my project settings, set my working days, etc., but I cannot figure out why this formula will not return the correct week number for Monday.

Can anyone give an advice? Thank you


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