The formula

SUM($A1:$F1) + SUM($G1:$M1)

in cell AA1 is not moved correctly to Cell AB1 by TAdvSpreadGrid.MoveFormula

MoveFormula gives

=SUM($A1:$F1) + SUM($G1:N$M1)

The correct supported syntax is: '=SUM(A1:F1)+SUM(G1:M1)'

and this will update correct with MoveFormula()