Help Reading Royalty Statement

gas price 9.95 vol181 gross1797.71 prod.tx 130.42 othded60.40 net1606.89 DDI .00019582 DDI vol .0013909 gross2.50 prod tx0.19 oth DED .08 net chg 2.23 "Can someone help me read this, PLEASE! Can the DDI volume number change ? Help Me Please!

Based on the DDI that you quoted, you were overpaid.