PokerTracker

Does this stat refer to times when we raise in the sb and folded to a 3bet?

There is no stat in PokerTracker 4 called 'Fold to PF 3Bet When Raised - sb'. Is that a custom statistic? There is a statistic in PokerTracker 4 called 'Fold to PF 3Bet After Raise' which is how often a player folds to a 3Bet after 2Betting from any position (although you can specify this for the SB using the 'Position' property for the stat in the 'HUD Profile Editor').