well you used samples right? so i guess the bass is involved in that sample panning you did .. the bass does change from the left to the right. I could give u an advice especially for fl studio, if u wanted to set the bass in mono but leaving your left / right adjusted sample panning. ( i think that would be easier for your recordings!
)
you could use the effekt plug maximus ( you should have it from fl 10 on ) to do that.
just put it on the master track.
At first you should use the preset "default" to get no compression on it.
then you choose the low band und adjust the stereo seperation option completly to the left and all low frequenzes will be send in mono.
its pretty useful espcially for such sampling projects.
I hope u can undestand me .. im from germany so my english isnt that good
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Greez!