In HEM (1) that is correct.
In HM2 we recently changed calculations a bit to make stats more accurate. When you are facing an all-in 3bet, you can not actually 4bet. New stats reflect that.
If player faces a 3Bet 3 times, calling once, folding once, raising once and 1 of them being an all-in, his stats would be: 4bet 50% (1/2 - he cannot 4bet when facing all in), Fold to 3Bet (1/3) 33%, Call 3Bet (1/3) 33%.
You can read more about it on our FAQ page: