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It could be several issues.
1. Backing plate not tight or front backing plate bolt holes enlarged not centered correctly causing the pin to not be straight in the spindle bolt inside bore rubbing on the ID of spindle bolt.
2. Spindle bolt a replacement with too small an inside bore causing same as above.
Many times backing plates are loose and when the brakes applies the backing plate rotated slightly and the brakes will apply but not release well because of item 1 above. Make sure all is well and tight. You will probably have to disassemble to see what’s up. Brent’s comment above is spot on as well. Sometimes the wedges are loose or worn or holes worn causing said issues.
Sometimes you can grind a bit off the shank of the pin if it’s over spec but I don’t like doing that. I’d rather grab a good original pin. Braze up end and shape if need be.
Larry Shepard