There are a few reason why they come back
1/ You do not use a product that eradicates mites at all stages (eggs to adult) many product out there are only designed toward the adult stage.
2/ You keep re-exposing your snake to mites through contact with other reptiles, or through your food source if you by live from a breeder/pet store, while rare they can hitch hike on you or feeders.
My guess is #1
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