DDj SX Problem-Snap sound when the FX deck number 1 or 2 is ON before assign deck

When the effect (even when in DRY) is On, a snap happens when I go to choose which deck I want to use this effect.

To snap sound does not happen, I need to do the reverse.

First select the deck and then turn it on the effect.

This snap is a big problem, because it's ear when I record the music and the master output.

Is it a hardware problem?

Whenever I go to record a SET, I end up having this problem. It's a big problem.

Im from Brazil. Sorry for the mistakes of writing.

Explaining a little better.

For I can not hear the snap. I need to assign that effect before turn on de ON button.

Ex: Deck 1 is playing. I assign the effect of number 1 deck 1.Then i turn it on the effect. That way I do not hear the snap.

The snap soundo come  on the contrary.

Deck 1 is playing. Then i turn it on the effect. Then i click on the assign button on deck. For example : Number 1 or 2.

them the sound snap happens.