I purchase a new home and in the basement I'm finding a section of cracked/split joists where the nail was nailed into the wood sill plate. After investigating, this one wall was not leveled with the joist end from the other side. I can tell because the builder did put some shims underneath some but not all so I'm seeing about a 1/4 gap between some of the joist and sill. What would be the best way to correct this if it needs to be repaired. I've attached a picture of one.