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Your door frame is no longer square.
The square door doesn't fit.
Someone used a grinder in the wrong manner, to try to make the thing fit for the time being.
Cobbled.
It was a bad job.
(and yeah, I've been there.)
You need square.
The door frame depends on the integrity of the rest of the house.
Everything else is a temporary fix.
Fix:
Pull the drywall.
Add extra 2x4s next to the door frames, and screw into place.
Add more studs in the center of existing vertical loads.
Screw together. Make as One.
Modern pine is very soft and bends easy.
The length of cuts for these new studs are dependent on the original out-of-square of the structure.
Floors may need to be jacked up, temporarily, to return the square to 'true'.
Add bracing at an angle.
Expect severe drywall cracking.
That is a separate matter to be dealt with later.
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