Crossover issue.

I have two identical crossovers... 1 left 1 right.
Every capacitor, coil etc... Are identical in make, value, etc and have just been redone by a reputable audio engineer.
Problem is the mid-bass section of the crossover has the right channel 8-10 db louder throughout the entire band 150 - 1500 hz. as compared to the left.
Ideas or opinions?

Thanks in advance.

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