export sounds bad on iPhone speakers

I can't figure out why my project export sounds terrible (clipping, distorted, crunchy) only out of my iPhone speakers. It sounds fine with headphones and on my Mac. I've messed with all the levels, everything is well below 0.0dB, I don't think anything is terribly wrong with my mix. I'm exporting as a wav file. I've tried 24-bit, not 24-bit, full volume, not full volume, compressed, uncompressed. I know iPhone speakers aren't great but it's much worse than audio usually sounds. Any advice is appreciated, I'm losing my mind lmao