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this sounds like the sliding part of the caliper may be moving aorund on its pins which isn't right
I've attached a 3d image of a typical brake caliper which follows the same design as yours
If you look at the 'guide pin' part you'll see that the main caliper with the pistons in it is meant to 'float' on these pins and is dragged onto the disc rotor by brake pressure
the spring in the caliper seals then pushes the pads off just enough to clear so they don't drag on the disc
from your description I suspect that 1 of the pins may be loose or is broken so I'd remove the wheel on that side and carefully dismantle the caliper from the hub , checking for damage and loose bolts as you go
do you still need help?
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