Possible Royalty payments missing

Hello,

I recently compared the statements of my oil royalty checks for the gross volume being paid on and the Texas RRC website and Texas Comptrollers office for what the oil company reported as gross volume. The amounts do not match up from my statement to the websites. Can someone tell me if I should be concerned with this and if so who should I contact for help as I believe I might be owed royalties for the discrepancies. I have contacted owner relations with no reply thus far.