I’ve had it for just over a month and I’ve cleaned it several times with the wipes that came with it, but it keeps leaving black deposits on my hand. It’s kinda weird because I can play with it for a little while and it leaves no trace at all, or it leaves a very light trace, and then the next moment I’ll notice a solid black streak on my fingers where the cue slides on. Is this totally normal or is it some type of defect?