I’m pretty sure it’s a known, and unfixed, problem that if the model:samples is the receiver/slave, and you use Mode TRK on the scale setup, then it WILL be one bar late.
That was certainly my experience with M:C as sender, M:S as receiver, and the fix(workaround) is to set the receiver to Mode PTN. I Think that’s all you need to do as a workaround.
Here’s my thread on the subject.
EDIT: Also: