Namaste. I have a question about Vali and Vyadh

When Rama killed Vali, he did it while being hidden Therefore, Vali be mane Vyadh in Dwapar and shot an arrow in Krishna’s heel while being hidden himself. My question here is - when Vali died at the hands of Sri Rama, he had attained Mukti. Once he attained Mukti, he should not have been reincarnated in Dwapar? So how could a Mukta jiva reincarnate again ? That’s my question. Thanks for reading.