Hi, regarding "Call Preflop 3Bet", the stat really is how often, when you raise and are 3bet, do you call. It's a specific situation and HM gives you the correct results here. Poker Tracker includes the following situations in their call preflop 3bet:
1) Any 2 players raising before you - so UTG raises and then CO 3bets. You are on the button. This is clearly not a "Call preflop 3bet" spot since it is an entirely different situation but Poker Tracker will include your action here in the stat.
2) A Limp Reraise - UTG limps in and you in the button raise him. It comes back to him and he 3bets completing the limp-reraise. Your second action here goes towards your vs 3bet stats in poker tracker.
Both of these situations are completely different and merging those into one stat makes the stat very misleading. In Holdem Manager it is quite simple. You raise and then you are 3bet and the call vs 3bet measures how often you call in this spot.