If they were repaired, I would GUESS the were only settling cracks, or possibly when they back-filled too soon, at original build. One pushed out of plane would suggest problems- soil, water, a major change to affect a solid concrete wall.
Today's code compliance makes you install the floor joists above to help counter act the forces of back-filling. When I started in '73, that wasn't required, I imagine there are a lot of cracked foundations as the builders were in a hurry. Be safe, G