Schematics question

[iok]

1. I'm using mint-tin-permaproto and the part I'm confused about is where pin22c has 12v applied to it. This voltage is then applied to 74AHCT14N's pin 11. Am I reading this right? Are we meant to apply 12 to 74AHCT14N's pin 11?

2. Also, there is a wire between pin 13(6A input) and 14 (Vcc). I'm unable to follow why.
   

3. and a wire between Vin, 5V and GND on MPM3610. Wouldn't that result into a short circuit? Or is it meant to communicate something else?
   

4. Black wire connects 74AHCT14N's pin 1 (A1) with with pin 7 (GND). It will generate an inverted output on Y1, but why? Nothing is connected to it's Y1.