Hi there, stange noise starting loops

Hi there!

I'm starting using some WAV loop files, this files starts ok with a normal player as Audacius or VLC Player, OK.

The problem is when i try to use this loops in rekorbox with the SAMPLER button or mouse click, it starts with a strange noise of 0.4 secs aprox. and then starts the loop, with Q activated and BPM SYNC, with Master in Deck or Master in panel Sampler.

As a result, the loops starts after the red master line and don't is sync with the music in the deck, i have a recently DDJ-400 controller in Windows 10 last update with last 1.03 firmware.

How i can solve it? thanks!