Back in the 50's, Axis were brought to the YO Ranch for a WT/Axis crossbreeding experiment in an attempt to get larger framed WT antlers. While the original crossbreeding worked as intended, the next generation reverted to original pure genetics on both sides. The program was abandoned.
Reloder, I have no doubt you are relaying what you heard, but I think someone was "Storying" you.
Axis and whitetail cannot hybrid or produce viable offspring. And nothing "reverts" back to "pure" genetics, even with species that CAN hybridize.
Now that being said, I believe YO did do some programs - but I believe it was RED DEER bred to whitetail and/or axis. The WT was a flop, but I think there was some success with redstag/axis that ended up with a semi-viable hybrid called a Staxis. If memory serves me correctly.
Now nature is a funny thing. Sometimes crossbreeds from two species that "are not supposed to" be able to breed so occur. Usually these spontaneous abort before birth. On rare occasions they survive birth but are deformed or have serious issues that cause them to die quickly. On super rare occaisions some of these survive a bit - but they are NEVER viable. Meaning they are sterile or otherwise cannot reproduce.
BTW, I also heard the "staxis" was actually spotted Sika (Dybowski) crossed with red deer and just LOOKED like a axis cross. That's just a rumor because Sika and Red Deer do cross.