I just listened to the WAV file and couldn't find any issues with the loop point. Are you using Unity or some other platform for the development? Have you tried any of the other songs to see if they have the same problem? I'm genuinely curious about this one now :)
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I just thought I'd let you know, the problem I was having with your tracks looping (making a cut off sound in between loops), wasn't your fault. It is a problem in GDevelop, the game engine I was using. I opened audacity and looped your tracks and they were as smooth as butter, no cut offs. I fixed the problem in GDevelop by choosing "play a sound on a channel" option, instead of "play a music file on a channel" and it loops beautifully. Just in case there are other GDevelop users, this may help. Thanks again!