Hi,
I have a blendshape with the same point order of the target but it unusually resizes.
You can see an illustration here: https://www.dropbox.com/s/odxo428c5yhfapb/MYA032_bShape_resizes.avi?dl=0
I used to have this problem in C4D and I solved it by having the the Pivot the same relative to the model. But it seems like Maya is agnostic with Pivot and Blendshapes.
Also, not sure if this matters but the blendshape is made through Maya>Zbrush>Maya.
Thank you for your time.