Has anyone noticed excessive soft spots in the latest batch of 5/4x6 Massaranduba?

I just finished a 400sqft deck in central Florida using 5/4x6 Massaranduba and I am losing my mind. Usually, this species is rock solid, but this current shipment feels almost spongy compared to the stuff I got last year. I had three boards pull right off the hidden fasteners because the wood grain was so loose the screws couldn't get a proper bite. My supplier is telling me it’s just natural variation, but it feels like poor kiln management or an issue at the source mill. Has anyone else encountered this, or did I just get a bad pallet from a bad run? I’m worried about the long-term stability of the framing connection if the density isn't what it should be. Thinking about switching to Cumaru for the next job just to be safe.