BPM doubles on running track when another track is paused

Was doing some streaming today and came across an issue a couple of times (doesn’t happen every time) where I’d bring in a track which is 87bpm and fade out one which is 174bpm. Once the 174 bpm track was out I’d hit pause and the audio of the 87bpm track suddenly doubled in speed. The bpm still read 87 bpm but the audio coming out doubled. Didn’t happen every time but it was certainly horrific when it did.