That might very well be ... actually that was my first instinct, but unlike when having problems with my guitars, I couldn't make it react by wiggling the cable, so I though it had to be something else.
But with regards to the push/pull .. Nothing happens when I push pull, no matter the EQ settings. But actually when I look in the users manual, there is no mention of a push/pull function and looking at the wiring, I find it hard to see, what Its supposed to do. There is one cable from each preamp and one cable to the jack from the volume knop, so ... I dunno?
But yes .. the bass itself is indeed absolutely wonderul. The balance is very good and the neck feels absolutely gorgeous!