22% is because they cannot afford (or don’t want) to offer 25%. The first offer from an agent is often not their final offer. Also the clauses in a lease or much more important than the bonus amounts. First drafts of leases are almost always totally in the favor of the operator and not the mineral owner. It will take some negotiation before getting a good lease. Suggest that you get an oil and gas attorney to look over the lease before signing. Also, NEVER, hand over a signed lease without getting paid at the same time.