I am currently renovating the entire second floor of my 1920's home and have run into an issue. The subflooring is currently unleveled and had intentions of pulling up the subflooring, adding a sister joist along the existing joist to relevel the floors and then laying back the original flooring. Upon pulling up some of the flooring we realized that the wall studs are resting on the flooring instead of the studs going through the flooring and being secured to the joist. Another dilemma is that the walls are off centered from the floor joist creating no support for the studs if the flooring is removed. I am currently unsure of what the next step should be or if there needs to be another route taken for this task.