Talk:Hit Dice/@comment-188.175.162.113-20190213203006/@comment-213.179.148.82-20190405102743

It happens because the leveling is simultaneous, so the total get divided by three.

In other words, the 1st level character obtains: 10+4+8 HP at first level = 22 HP, divided by three = 7.

This is also the case if you level two or more classes simultaneously in game, the rounding can get in your favour. Especially important for triple-classes.