Health bonuses are multiplicative, so 20% from a necklace plus 20% from a talent comes out to 216hp. Foot Knight gets 25% from his HP talent which gives him 9 more HP for a total of 225. I think you should increase the health gain on the IB and Unchained talents very slightly to match so that all three classes can get 225.
The effect on balance would be minimal as 9hp is basically 1 damage tick from standing in a fire. But I think it looks nicer and more readable if HP is displayed as a multiple of 5. This also matches the “neatness” of other health totals achievable by other classes. Zealot has 150hp like the other tanking classes, but does not have an HP talent so the most he can get is a nice even 180hp using a necklace. Classes with 125hp can use a necklace for 150hp and 100hp becomes 120hp.
I guess it’s not a huge deal but it just makes sense to me.