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I installed a 240v outlet for a new GE stove with its own 50 amp breaker. I ran a 50' section of 6/3 cable, 18' of it from breaker box to a vent in the foundation then I stapled the remaining to floor joist to my 240 outlet, plugged in the new stove and only the clock and stove light work. When I was troubleshooting I found 120 on both hots to neutral and very little on hot to hot same reading at the new outlet.
That breaker is what we call a "double-stuff" -- it is designed to fit 2 breakers where one normally goes.
Your panel is in the GE Q Line. They do double-stuffs a little bit differently. But the same basic concept applies, you have 1" wide spaces, and each space only has access to one pole of 120V. For more on how spaces work, read my Q&A on "what is a double-stuff breaker". In particular, note what a quadplex breaker is.
GE does not do duplex/quadplex. They offer individual 1/2" wide breakers and you sandwich them together into "build your own double-stuffs". If you want a duplex 15/20, you just build it. I believe you see this setup in row 3.
Now as far as quadplex breakers, they have the 240V breaker you have right there. Similar to a quadplex, you mount that thing straddling 2 adjacent spaces, so it is grabbing a bus stab from each. That leaves 1/2 space empty above and below. You fill those with 1/2 space wide breakers: Essentially, it's a "build your own quadplex" :)
You are trying to install it on an even space, in row 1, instead of straddling 2 spaces. I would expect the breaker to be keyed so that is impossible, so I don't know how you forced it in. If you damaged or altered the breaker, throw it out and get another.
My best advice is to move the breaker in row 2 up to row 1, and pull out the 1/2" breakers in row 3 out. Split them apart, stick this new breaker in the middle of them, and put all that back into rows 2 and 3.
The two two are from the same phase I would guess. Do u have a double pole breaker? Make a picture from your breaker box wiring. Double check the wiring your outlet as well.
GE's Q-Line of tandem breakers is designed so you have the option to put it on both phases or not. So you essentially have it on the single phase and need to adjust it so it is on both phases.
