differences of terms in gradmat output of v3.7 and v4.6 are large
according to BH kind reply, this bug is caused by an updated calculation method.
To further explain, I’d like to cite his explanation “During that transition, we found several point sources very close to the boundary line of outer domain got handled differently.”
They address these issues and released it as a part of SMOKE v4.7.
Thanks for the detail update!