#VALUE! error when I try to insert a row

[Enz]

I have created a spreadsheet that I seem to be receiving an odd error
in an intermittent manner.

I have a formula =IF(ISTEXT($S9),DetermineValue(L9),0) that totally
works, where DetermineValue is a function I created that returns an
integer. I populate the same tab with input data, and the formula
above and function performs 100% correctly. (no array formulas or
anything too exotic) - This is done in Tab B. S9 cell is populated
using a vlookup that references a range in Tab A that always populates
correctly.

On another tab (Tab A), when I create a brand new row, well below the
range that is used in a Vlookup, I get a #VALUE! error in the formula
created above.

I have tried to copy the formulas to a new sheet, and started over
again, and I still get this unexplainable error. The even odder thing
is, when I click on the cell with the #VALUE! error, I merely put my
curser on the formula bar and hit enter the =IF(ISTEXT
($S9),DetermineValue(L9),0) recalculates correctly again. But F9 does
not do resolve this. I had a colleague review all formulas and we
currently don't see anything wrong.

I noticed that this occurs at different times, but I know it occurs
every time when I insert a row in tab A that is well below anything
being referenced.

Any ideas on what I may try to check next? Or has this occurred to
anyone else's spreadsheets?

Thanks & regards,
Enzo