Official comment
rekordbox 4.0.7 was released today with an improved crossfader curve within export mode. Please update rekordbox and see if this addresses your concern.
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Preparing playlist on Rekordbox 4.0.1 and the Crossfader doesn't work Why????
rekordbox 4.0.7 was released today with an improved crossfader curve within export mode. Please update rekordbox and see if this addresses your concern.
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It's a known issue. The best thing to do now is to switch to performance mode and then switch back I believe. Or nudge the cross fader slightly and recenter before going back in export mode.
Excelente, and when the update is ready
The answer to "Why?" has been answered by @Tu Tran below; it's a glitch and has been somewhat addressed but some users still have a problem with it, so it will be fixed in a future release.