Statement sql not refresh (take new changes) in Reports

Hi, I have a report of a grid with some fields in the statment select.
Example:

Select myvalue1 as value1, myvalue2 as value2
from mytable
where mykey = value

If i Change the field myvalue1 TO a formula:
Select myvalue1/2 as value1, myvalue2 as value2
from mytable
where mykey = value

The grid shows same results of first select.
i can see that SC no refresh the value of a field changed.

I think that is a bug. I tested with other reports and i got same results.