I'm not sure what you mean. Temu has nothing to do with this.
* people buy something on Amazon, return it due to defect or just don't like it
* product is currently sold in lots via auction by Amazon via bids, wholesale (not on amazon.com, but via other channels)
* 3rd parties buy the lots, sort, and re-package and sell on Amazon
As Amazon joins all listings for "shirt brand $x colour $y" into one product listing, this means that the original seller of the shirt, even the brand owner, now is competing with its own returns.
