Distorted Sound from DJM-S11

Hello, 

I have a DJM-S11 mixer - with Serato connected to input A. Connected as well are 2 CRSS12's all updated to the latest firmware. On the phono channels with ground. The decks are in digital mode. 

The problem that I am having is that anything connected to the right channel gives me a distorted sound when using serato. If I connect my phone as a device to the Line portion no issue. I have swapped both decks same issue, swapped both cables same issue. 

Any suggestions as to what may be wrong, if it is a configuration issues within serato. I do see the item playing just the sound is distorted. It is a Windows Laptop with 16gb of ram Core i5. I have not swapped to Laptop B to see if it makes a difference. 

Thanks,

Niel