Brake constantly touching on one side

[dude]

I have this case where a front brake reopens itself only to one side, which causes the pad on the other side to rub against the wheel.

I made sure it's properly screwed to the frame and the pads are at equal distance before braking, but as soon as I brake, the problem is back.

By the way, I have a doubt about this brake, because there's another problem which may explain the first: I can't pull the tensor down without creating a 90° angle in the cable (see 2nd photo, that's before using the tensor). I'm wondering if someone may have installed a rear brake at the front of this bike.

Thanks

https://drive.google.com/file/d/1JVsKJhXsERhBN5-9FMYU7bUUAbvN6j33/view?usp=sharing

https://drive.google.com/file/d/15HG38TEysc-UTgYu_A2PI29zTo05E572/view?usp=sharing