Need some help

Sorry, I screwed up conneting my sh!t the other day all is ok here.

have you checked if the samples is mono???? Does you mixer have a mono switch. Play the samples and route it to out 1 and 2 or main out.
Take the output jack from the mains and plug them to one and two
input on the mixer.

Next check the bus routing on each track of the mixer. You should be able
to choose bus 1 and 2. Pan hard left for track 1 and hard right for track 2.
this will send track 1 to bus 1 and track two to bus 2

now on the Buss faders, you can choose where you send the bus.
buss one should go to left and bus two should go right. Sometimes people
click left and right which might be why your bus 1 is going to out left and right and is not reproducing the pan.

yea man you have your stereo and mono plugs mixed up...holla