Hey Orion!
The 'lie' that you're describing is actually implemented that way intentionally. Instead of doing poison four times (the same amount of attacks), it only does two to prevent severe exploitation tricks with Pufferfish + Epinphrine (many consider having 12 damage (8 physical, 4 poison) to be overpowered). If you think about it, having multiple Pufferfish (in your deck or conjured by Fractal) with Epinphrine would make speed poison decks too strong and ridiculous to counter.
But yes, it only poisons twice, as desired by both the community and lead developers.