The Natural Armor bonus seems to be applying when not raging. Needed Fix: Natural Armor bonus should not apply until the Rage box is clicked in the "In Play" tab. This appears to only be the initial +1.
Parts of the Bloodrager Draconic Bloodline stack with Dragon Disciple levels, but not all of them (or none of them.) It is not 100% clear if this should be allowable at all. But I have a GM allowing it for me currently. With 4 levels of Bloodrager and 4 levels of Dragon Disciple, the character should get +4 NA (it does show this when raging, but weirdly +3 when not - see above). If it should stack, then the Energy Resistance should go up to 10, the Breath Weapon should get an additional use per day, and the Claw attacks should go to 1d8. The bite attack should also happen during rage, rather than be a certain number of times per day.
The Bloodrager Breath Weapon has an error. They should get it at 8th level, not 9th level.
Parts of the Bloodrager Draconic Bloodline stack with Dragon Disciple levels, but not all of them (or none of them.) It is not 100% clear if this should be allowable at all. But I have a GM allowing it for me currently. With 4 levels of Bloodrager and 4 levels of Dragon Disciple, the character should get +4 NA (it does show this when raging, but weirdly +3 when not - see above). If it should stack, then the Energy Resistance should go up to 10, the Breath Weapon should get an additional use per day, and the Claw attacks should go to 1d8. The bite attack should also happen during rage, rather than be a certain number of times per day.
The Bloodrager Breath Weapon has an error. They should get it at 8th level, not 9th level.