Using Substitute modifier results in a suddenly massive mesh

[willbrosch7]

Hi,

I'm having trouble when trying to use the Substitute modifier to swap one 3D person for another.

When I switch them over the mesh is substituted in the right place but is always 100x too big. If I substitute the models in the opposite order the resulting mesh is always 100x too small. Why is this? Is it a bug or something to do with my models?

Please help me out guys.

Thanks

-Will

[willbrosch7]

Also,

When I export my scene and bring it into Keyshot, even if I don't 'Substitute' anything beforehand I get the same scaling errors.

Only SOME of my models have these errors.

Only the ones that turn huge when they're using with the 'Substitute' modifier.