What oil interests do we own in Lea County NM?

I have a mineral deed recorded in Lea Cnty, April 1938, indicating my relative was sold an “undivided 6 acre royalty interest” in sec 35 24s 37e , North half. (N1/2). Problem: There are 9 producing wells in the area, and the partnership to which the relative transferred the rights is only receiving royalties form one well. It is plausible that the seller of the rights originally did not have the proper title, or some acreage was transferred to others. Is this a problem for an attorney or a landsman? If so, what is the best way to find one in Lovington (Lea cnty seat)?