Leopard wrasses ship horribly and are notorious for being easily stressed (once they are established, I find them fairly hardy, though). Had these wrasses been at the LFS for a few days and eating? Moving them from the LFS to your home tank could certainly have stressed them further if they had just arrived there. I would tend to agree with
@4FordFamily that this is indicative of a swim bladder issue, although I'm not certain that it necessarily has to be an infection. I've observed this same type of result from leopard wrasses after being shipped from out west to the east. I was told that the pressure change from flight over the Rockies is harder on the fish. I'm not sure how true that is or not. I do know flying screws my body up even though the cabins are supposed to be pressurized, so I think it's at least conceivable it might affect some fish negatively. Or it just might be the additional stress. Or an underlying infection is already present and the stress suppresses the fish's immune system and the results manifest themselves after a day or two when the infection is able to start compromising the fish's systems where it was held more in check prior.