Please try at W15
Formula:
=IFERROR(1/(1/(IFERROR(COUNTIFS(INDEX(INDIRECT(TEXT($F15,"mmmm")&"!E9:AI88"),MATCH($B$7,INDIRECT(TEXT($F15,"mmmm")&"!b9:b88"),),),W$14,INDIRECT(TEXT($F15,"mmmm")&"!E8:AI8"),">="&$F15,INDIRECT(TEXT($F15,"mmmm")&"!E8:AI8"),"<="&$G15),)+IFERROR((MONTH($F15)<>MONTH($G15))*COUNTIFS(INDEX(INDIRECT(TEXT($G15,"mmmm")&"!E9:AI88"),MATCH($B$7,INDIRECT(TEXT($G15,"mmmm")&"!b9:b88"),),),W$14,INDIRECT(TEXT($G15,"mmmm")&"!E8:AI8"),">="&$F15,INDIRECT(TEXT($G15,"mmmm")&"!E8:AI8"),"<="&$G15),))),"")
I just duplicate Sheet Jan and rename to Feb. Weeknum still wrong, Merge cell is never be a good idea.
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