Obviously one caliper is frozen in place.
Disassemble, clean & lube the center pivot parts.
Keep track of the parts in order they come off, although that shouldn't be difficult.
Then, it's trying to hit the sweet spot on how much to tighten the acorn nut.
IF you actually get them to function correctly, you won the lottery!
These brakes tend to be very flexy and if the wheel is a bit out of true, you have problems.
In order to keep the pads from rubbing, you have to have them too far apart to get hard braking before you bury the lever into the grip. The wheel has to be true to keep the pads close without rubbing.
I actually got into wheel truing because of these type brakes. I flipped bikes, and I simply needed all the help I could get to makes these brakes work well enough to have a semi clear conscience. Thinner grips sometimes helped.