Quote Originally Posted by Menagroth View Post
"You determine your available spell slots by adding together all your levels in the bard, cleric, druid, sorcerer, and wizard classes, half your levels (rounded down) in the paladin and ranger classes, and a third of your fighter or rogue levels (rounded down) if you have the Eldritch Knight or Arcane Trickster feature."
this seems to read that the 3 groups are added together independently before dividing by the appropriate number. .
The problem is that (according to this paragraph), if you're playing a half caster, you add them together before you round down, whereas if you're playing a third caster, it assumes that they're played in isolation, so you're only invited to tally one or the other before rounding down.
At worst they're trying to nerf MCing with third casters, but the much more likely explanation is that it's just a poorly worded paragraph.