The Archetype "Invulnerable Rager" grants an all-the-time DR (OK, works)
and at L3 choice of Extreme Endurance (Hot) or (Cold) - which grants hot/cold Endure Elements effect and "1 point of fire or cold resistance for every 3 levels beyond 3rd"
At L8 I'd expect 1 point.
6.05.05 is the first version to show the Energy Resistances clearly (PDF export only, not Preview)
Picking Aasimar race, and Hot resistance, I'd expect to see 5/5/5/1 as energy resistances,
but it actually shows 5/5/5/blank
pathfinder core supplements rule-set
All that remains is the formula. APG says "gains 1 point of fire or cold resistance for every 3 levels beyond 3rd."
Barbarian 8 should show Fire 1, but shows Fire 2.
Oh drat. Misread the line. Thought it said gains 1 additional point. Easy change.
fix confirmed in overnight build