if you click too late, the lag stops it from registering it.

it is a well known fact. most people who vote after the timer reaches 4 seconds, they veg. sometimes you might survive.

I checked the voting log, but there's no vote registered at the end of the day. You unvoted Bestwill around 10:48 and that's the last registered vote of you.
Maybe you thought you clicked but your mouse glitched a bit? Or you clicked just a tiny bit too late?