using apply and merge on a gridtext column

Hi,
I have a grid where one of the columns is supposed to be calculated based on a certain attribute value. The gridTextColumn is below. It just uses a date field called "fssIssuanceDate_datetime" and is supposed to add 4 days to the date if the market type ="F". Otherwise, add 10 days if the market type ="P". This calculation is supposed to happen in a rule that is applied to the data.
For some reason, it is always adding 10 days meaning it seems to ignore the market type="F" where there are definitely records that are equal to that. Everything looks correct to me. The constants being used are correct such as the 4 and 10 days so I don't know if it's something to do with using the apply in a gridTextColumn.

a!gridTextColumn(
label: "FSS Issued On",
field: "fssIssuanceDate_datetime",
data: if(local!datasubset.totalCount=0, {},
...

OriginalPostID-236198