Travis, that is fairly common. The title work done for a D.O. is often separate from, and more complete than, the title work done when leasing. An incorrect Division Order won’t affect “what you own”, yet it will be the basis for what the company pays. So it is best to correct any mistakes prior to signing anything. It is tedious and annoying to correct it after they start paying at the wrong rate.
It’s possible they’re right and you own 1.5 acres less than you thought. Ask the company to demonstrate how they derived the ownership percentages on both their Lease calculation and the D.O. Then run your own numbers to confirm what is correct. It is also possible they’re wrong and you do own those additional 1.5 acres. Good Luck.