Headphones downpitch playback

When I use my laptop's built-in speakers, playback works just fine, but as soon as I use my Bluetooth headphones, the entire score downpitches by about (but not exactly) 2 semitones. Because it's not an exact transposition, I can't just change the notes in the score to correct the pitch, but even if I could, I don't want to have to do that every time I want to use headphones. This is not exclusive to any specific score; I have tried all of my scores and this issue persists through all of them.