Yep, the two 40s will be for the stove, two hot leads (black & red) with a single neutral (white) and of course ground (green or bare). Not sure why they build these monsters with 15s at either end, my 30 amp breaker for the Electric Dryer is the same idea. The reason the two 40s are tied together is that if there is a fault in either of the hot lines to the stove, both breakers will be tripped disabling all circuits to the stove. This is for safety reasons obviously. The two 15s are I guess just nice and convenient, but have nothing to do with the stove circuit.
With all 3 wire circuits, 2 hots and a neutral, the neutral needs to carry the return current for both hot wires, so you might want to double check that all connections are tight, particularly the neutral. What size is your service (main breaker) 100 amps or higher?
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