excel formula changing????? help

S

Suzanne

I am having a problem with my formula changing all of the
sudden. For example, I have columns A1 through A20
A21 is adding columns A1 thru A7 =SUM(A1:A7)
A22 is addding columns A8 thru A10 and A14 thru A20
=SUM(A8:A10,A14:A20)
A23 os adding columns A11 thru thru A13 =SUM(A11:A13)

The problem is that cell A21 is all of the sudden adding
cells A1 thru A20, I have changed it back a million times
and cannot figure out why it keeps reverting back to add
the whole row. I have used this formula for the past year
and now I am having this problem. What could I be doing
wrong.
 

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