Why don’t buyers accept their items?

I’ve been selling and buying on Poshmark for years and I always make sure to confirm when I receive an item I’ve purchased (and rate it), as soon as I can when I receive it because I know that will release the funds to the seller. The past 20 or so sales I’ve had, I’ve had to wait the full 3 days for PM to release my funds to me because the buyer never accepts their order. I don’t know, this is just annoying to me!