Tascam Dp-01 Volume Drop

[epitone]

Hi! Quick question...after I export a track from the Tascam DP-01 onto my computer, there is a significant volume drop to the point where i have to turn my speakers full volume even to hear the track at an appropriate volume. While I'm listening to the track on the Dp-01 via headphones, the volume seems fine. What is the reason for the volume drop when the Track i've exported becomes a WAV file on my computer and how can this be avoided?