Problem with motors or escs, help!

Hi all, I´ve been reading you for years in the shadows and not I´m desperated and need your help

Just build an F450 style quadcopter using a APM 2.6 board, last firmware updated.

Before you say it, yes, I have checked motor spinning directions and props, and they are all correct.

The point is that then I´m going to take off, the 2 back motors spin much faster than the 2 others, causing the drone to flip.

When I make an all in 1 calibration and I test the calibration afterwards, all 4 motors spin at the same time, causing an equal thrust

I don´t know what else can I do to solve this issue :(

Any helplight on this be thanked!

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