I don't know why it isn't 76kHz like yours
I'd guess that your probe loaded pin 14 to the point of reducing the free-running frequency. Might want to check into some decent 10:1 probes.
But if one just wants to measure the free-running frequency, I believe pin 10 is specifically intended for that. Pin 10 outputs the VCO frequency divided by 4.
Cheers,
chazix