DDJ-FLX10 : master cue volume VS channel cue volume

Hi! Here is a important bug here for DDJ-FLX10 : master cue volume VS channel cue volume. (Master cue volume level is louder than channels cue volume level) Strangely, when we enable the PC speaker (button on the right of preference in Recordbox) the problem is resolved... It's a good news!!!....It proved something can be done fir this issue.  But for sure it's a bug or problem (when disable). So there is definitely a "gain level structure" wrong when the PC speaker sound card is disable in Recordbox. Can you test it and get back to us? We are a lot of people reporting this issue on social media group. Thanks for your help, test and answer. Best regards, Patrick