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Mute problem

Is it normal for a mute switch to mute playing, but not the pop from plugging in an instrument? I've got a carvin b1500 and when I was switching basses at a gig last night I got a loud pop when I plugged in the second bass. I thought that I had forgot to turn the mute switch on, but it was when I checked and no sound came through just from playing. Is this normal or is it time for a trip to the repair shop?