Is this normal?

Definitely not normal. I'd take it to a different store or call Apple CS.

 

It might be related to the trackpad's lower right corner being a spot to "right click" something on your screen, as if you were working with a mouse. I believe it needs to be activated in settings because I know it's supposed to work, but it doesn't on mine... yet. I use either the 2-finger tap or control-tap.

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OK - here's how to activate it:
Settings > trackpad > point & click option > secondary click > pull down menu > select two finger tap, lower right corner OR lower left corner.

BTW - the 2-finger tap often gets in the way of the 2-finger drag to scroll, so I'm glad you asked this question ... I discovered something new!

 

You can set it up to function as a right-click, but it shouldn't make that noise. There shouldn't be any noise from the trackpad unless you're actually pressing it hard enough to count as a click. I can tap anywhere on mine and there's no noise at all. I'd definitely take it in to get looked at or give them a call. Explain that when you first took it in they said it shouldn't do that, but when you got it back it still does. They should fix it for you.

 

Holy crap! I was thinking to post this as well!
I have the EXACT same problem.

Not anywhere else, but the lower right corner.
And its not always. Only couple of times.
It annoys me a lot.
I was thinking to take it to Apple soon.

 

i just tested this on my "15 late 2011, and i do NOT have this problem, so i think you should get it tested.

 

how hard are you tapping? Because my macbook does that only if you push the track pad down (to count as a click). I am pretty sure it is supposed to do that but with yours being such a light tap to do that you might have a problem there!

 

It's not normal. Perhaps try adjusting the pitch of the trackpad by turning the screw underneath it (behind the battery).

 

Actually, no it doesn't. All very solid, even the right click corner (other than when it's clicked). BTW, the lower right "Corner" is actually a quarter circle that is active over about 1/4 of the touchpad, but only if you push on it. It doesn't respond to a tap.

I'd agree with one of the other posters that you should take your MBP back to Apple for a fix or replacement.

 

That's so strange. Sort of reminds me of the first generation nano's wheel sound.