When the S2400 is synced externally (in my case, via USB) it plays back in sync with my DAW.
However if I start the S2400 manually (Shift + Run/Stop - useful when wanting to play back a specific section in Step Program mode) the S2400 plays back at a faster BPM than what is displayed on the device (and what is being sent via USB).
This can be easily recreated with a blank project at 120bpm and listening to the Metronome.