[GNC] Why does Reconciled field auto mark "n" & "c"

[Fran_3]

I've been importing csv files into checking with only 5 fields in each import...
Date, Num, Description, Deposit, Withdrawal
During the import process I assign the appropriated expense or income account and it works fine.
I also manually enter some transactions.
The Question: 

The Reconciliation column ("R" column) seems to be auto choosing either a "n" or"c"What is causing that?
Thanks for any help.