That's actually a tricky question.
Most people think following:
"Cold Calling means someone has raised Preflop and another player has 3bettet the opener and someone behind them "COLDCALLED" this 3bet"
That's pretty comon, but this definition isn't true.

A coldcall in HM2 / PT4 is following:
"Cold calling is when you have no money committed and you call a raise preflop."

That means, when someone opens from UTG, MP, CO and another player calls on the button his TOT Cold Call goes up, but you will never have a real idea what his range will be there in the longrun.

Therefore: Just remove that stat and add "Coldcalling 3Bet's" which i refer to in definition number 1. It's way more usefull and you get way more information out of it. (Which ranges he overcalls to a 3bet).

And then again:
UTG Raises, BU 3Bets, BB calls.
--> The BB didn't "Coldcall", there was money invested. He "Calls 3Bet" stat gets up.

Ahhhhh i'm writing romans.
Just ignore that stat, there are more useful stats out there lol.