Help with understanding a notice from NJ unemployment monetary re-determination?

I am recently unemployed and have been receiving unemployment benefits for 2 months. I have recently been mailed the exact same Benefit Determination letter but this time with an 'X' in the section that states, "this indicated a monetary re-determination based on the receipt of supplemental information. This may result in a refund liability for any benefits paid." Once again, nothing on the benefit determination has changed. I am confused as to what this means.