Welcome to the forum.
Not knowing all of your details, this is just a theory. The age of the deed may be important. It could be several generations old and has passed through several probates to fractionate down to your level. The deed may also have a fraction stated within it such as 1/32nds or something similar.
There have been quite a few leases taken in the last three years in sections 5 & 8 of 12N-2wW. Make sure that all of the heirs have their names and addresses properly filed in the Roger Mills courthouse with the clerk of deeds so that the land men can find you.
Yes there is lots of leasing at this time in RMC. I would suggest you visit the Roger Mills County Clerk website & search property records. You can search by name and or by property description. All mineral deeds & property deeds & oil & gas leases will be recorded there.