Is it a Stanley iron? If its another brand, could it be longer than a regular Stanley iron?
Check that your iron is inserted bevel-down. Fitting it bevel-up would cause it to protrude too far.
If you removed the Yoke during restoration, you may have re-installed the Yoke 180° from how it should be, preventing it from pulling the chip-breaker/back-iron all the way back up.