Dryer & Stove share breakers in 1972 apt
One of the serious sparkys will know every detail about your panel, but it's obvious from the labeling that it has a pair on each phase, so the location of your 40 and 50 A dual breakers needs to shift down (or up, for the 40 that will be a 30 when you fix it right) by one space to actually supply 240V.
Which means someone highly unqualified has been working in this panel; there may be other problems I haven't spotted. That one is deer in the headlights blindingly obvious.