Tempory hit points?

[Kielbasa]

So I'm on my bard and trying to figure out what takes priority when determining temporary hit point auras. You would think it is the highest total but that does not seem to be the case. Can someone explain it? There are times in a party when I know my temp hp from warchanter enhancement tree are the highest in the party but they keep getting overridden by a lower number from someone else either another bard or maybe a warlock? Help?

[voxson5]

Multiple bard ballads will overwrite each other on each pulse, everything else should stack with bard ballad temp hp.