I guess it’s a little weird that the XP and XPSUM don’t line up. As for the XP itself, having 0 at the start or end can work I suppose. It’s either the “XP needed to reach this level” or “XP needed to leave this level and go to the next”.
I do think the dragons are now a little inconsistent with building though. For example, if I look at the line for a level 15 archer I see the lumber needed to get to level 15 from level 14. But if I look at the line for a level 15 dragon I see the xp needed to leave level 15 and get to level 16.
But tbh I’m just glad to have easy access the data and will happily take it in either format