It is common for the taking and viewing lenses on TLRs to go out of sync. The only way to be certain about what is going on is to test the focus of the taking lens first. You can put ground glass on the film plane, open the lens, and view a distant object. If the taking lens isn't focusing at infinity properly, the adjustment involves loosening the focus knob and resetting its position. Then you can adjust the viewing lens to match- there is a set screw on its mounting flange to the upper right side; all the lens shrouding needs to be removed to get to this.
Rick Oleson might be able to guide you through shimming the screen, ask him. But remember- the important thing is how the taking and viewing lenses are aligned, not what the viewing lens shows on the screen.