Different values on lease payments

I have a small mineral rights lease in Coal County, Oklahoma. I recently did the calculation to check the interest percentage (decimal) and came up with 0.00031388 but my statements from the well operator says 0.00030336. I have emailed owner relations for an explanation and am waiting a reply. For some strange reason on some entry on the statement they are only paying me 0.00001054 and 0.00001055. Any idea why the lower value?

For the 1st question, Its likely a rounding error on an estate thats been split up numerous times. If the well generates 10 Million, youre getting $3,138.80 vs $3,033.60. Hate to say it, but the odds of you getting this corrrected are slim to none. As to the 2nd question, appears you own half of what you think you do or only 1/2 of your sections interest was pooled for the well?

Bob thanks for that info but on the lower percentage (decimal) I think you missed a zero. the lower decimal is about 1/20 of the larger decimal not 1/2