You should use another variable for the destination row as it's no always the same as the source row.
Sub Simulate()
Dim away_team As String
Dim home_team As String
Dim away_ML As Long
Dim home_ML As Long
Dim away_line As String
Dim home_line As String
Dim loca As String
Dim dstRow As Long
g = Sheet3.Cells(Rows.Count, "B").End(xlUp).Row
Sheet3.Range("K4:BF101").ClearContents
dstRow = 4
For a = 4 To g
away_team = Sheet3.Cells(a, 7).Value
home_team = Sheet3.Cells(a, 8).Value
away_ML = Sheet3.Cells(a, 4).Value
home_ML = Sheet3.Cells(a, 5).Value
home_line = Sheet3.Cells(a, 3).Value
away_line = home_line * -1
loca = Sheet3.Cells(a, 6).Value
Sheet3.Cells(dstRow, 11).Value = Sheet3.Cells(a, 2).Value & "A"
Sheet3.Cells(dstRow + 1, 11).Value = Sheet3.Cells(a, 2).Value & "B"
If loca = "H" Then
Sheet3.Cells(dstRow, 12).Value = "A"
Sheet3.Cells(dstRow + 1, 12).Value = "H"
ElseIf loca = "N" Then
Sheet3.Cells(dstRow, 12).Value = "N"
Sheet3.Cells(dstRow + 1, 12).Value = "N"
End If
Sheet3.Cells(dstRow, 13).Value = away_line
Sheet3.Cells(dstRow + 1, 13).Value = home_line
Sheet3.Cells(dstRow, 14).Value = away_ML
Sheet3.Cells(dstRow + 1, 14).Value = home_ML
Sheet3.Cells(dstRow, 15).Value = away_team
Sheet3.Cells(dstRow + 1, 15).Value = home_team
Sheet3.Cells(dstRow, 16).Value = home_team
Sheet3.Cells(dstRow + 1, 16).Value = away_team
dstRow = dstRow + 2
Next a
End Sub
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