You are using PPS mode for LTC mining. All valid shares are counted as confirmed in this mode. There is no waiting for 15 confirmations, thus there is nothing to display in Unconfirmed Rewards column.
Thank You for the reply.
Ok, but few days ago it was showing Unconfirmed Rewards. In fact most of Feb it was showing in that column...
Probably you were using RBPPS worker few days ago.