Corporation Bank — different & incorrect balances shown in netbanking site

Address:	700038
Website:	www.corpretail.com/RetailBank

1. The balances shown in the net banking site have different balances for same day.
For eg -
When i check balance from statement period 1st Feb - 13th Feb it shows different figures and different CLOSING BALANCE & when i check balance from statement period 3rd Feb - 13th Feb it shows a different figures and CLOSING BALANCE. ??? how is it possible. (Have attached 2 screen shots for the same ending date with 2 different closing balances)

2. Many a times it shows a negative balance. My account does not have an OD facility so how is it possible to have a negative balance amounting to 9 lakhs sometimes.