Distorted sound in offline player and Cue problem ?

hello,

I've recently downloaded Serato 2.5 and when ever I play a track in the offline player it sounds very distorted and plays a bit slow. I'm using 2x Denon 3900 with the Rane SL 3 and whenever I press cue on the CDj the track stops but it doesn't go back to the beginning of the track, I must do it manually on the software and this is a bit very frustrating. Whenever I calibrate the threshold jumps to the far right also.
I'm a bit new to Serato so a little help would be very appreciated on this matter.

Im using Windows 10 2,2GHZ B960 processor
4GB Ram
750GB HDD
Rane SL3
Denon 1600 mixer
2x Denon 3900 CDjs


Please help.
Thanks!

I didn't find the right solution from the Internet.



References:
https://serato.com/forum/discussion/1625030



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