32.768kHz crystal making audible noise
I think you mixed up pin 5 and 7. Pin 5 (right upper corner of the IC in your PCB layout) select modes, pin 7 is GND which is obviously needed :)
I would suggest connecting pin 7 to the upper (w.r.t your layout) terminal of C13, but am missing that connection as well. Or is it a via within the pad?