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PLS, FIX THAT BUG: mons with Levitate are loosing HP with spikes, Stealthy Rock and Toxic Spikes, i wasdoing a league of showdown, but something wrong happened, spikes, stealthy rock and toxic spikes was doing damage on pokes with LEVITATE ability.
Did a Mold Breaker mon use a phazing move? (also Levitate mons are always hit by Stealth Rock, that's just a normal thing, no weird edge cases necessary)
We need a replay to verify if this behavior is really a bug. Nothing can be done without a replay. If it was a bug, please report it in the bug reports thread.