[PD] pasic equalizer problem

[nexyufuli evo]

hi list
 . .i try to build a equalizer . . .but i got some problem.in neutral 
position the output isent linear
with a multipliation be -1 in one band it is better but not perfect . 
.but i dont understand the reasen . .
could please giving me a hand   . .?
thanx nos
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