You ruined your nice GE load center by putting in a cheap Square D breaker
I don't know why some have a hate for Square D. In my newest subpanal it is a mix of GE and Square D. Neither brand ever has problems. I think both work great.
But that could just be me.
Nothing wrong with Square D, they make good stuff.
If laws in the US are anything like in Canada, you might have an insurance problem if there's a fire. You should only use GE breakers in a GE panel, even if a different brand fits. Insurance companies will do their best to find a reason not to pay, and using the wrong breaker is a golden ticket for them.
My main panel in my house is a Cuttler-Hammer, and my panel in my detached garage is Seimens. Both brands of breakers are interchangeable, and I've done it in a pinch, but you need to be aware of possible insurance problems if there's a fire.
In the US as long as the type of breaker is for the panel, and you didn't "mod" any of the tandem breakers to go in a full sized slot you are okay with insurance.
The big no no in the US is AL wiring in the home, that will really piss off your insurance if there is a fire.
I live in a family farm house. Part's of it are over 100 years old. Needless to say it's had a few electricity rewires over the years. It's had lots of additions over the years. The newest big addition was around 10 years ago, a lot of electrical was redone then.