I’ve a feeling it’s software. Here’s a couple of shots showing the closest I can focus with the normal lens, compared to the zoom lens, which is perhaps not surprisingly, a lot closer 
Focusing was a bit better than the photos, I’m shaking about thanks to my stupid nerve damage and the cold, with the snow today.
Focusing was a bit better than the photos, I’m shaking about thanks to my stupid nerve damage and the cold, with the snow today.