Hello, I've been getting weird results when I render but also in the viewport with this SOP level pyro dust explosion. The result is pyro that looks like a bunch of hotcross buns. I've used a pyro configure fireball tool for it. I've turned off played with turning off all of the shape tab parameters (except for boyancy and flame expansion) to see if that would make a difference. Have also played around with the substeps and bounds padding which helped to an extent but not completely.

Any ideas on how to fix it??

Dial your density down a bit in your pyro source. Density is so high that the voxels are full up to their borders.