unexpected incorrect result when using sculpt layer and pose switch

Hi,
Here is my case. I create a sculpt layer (in default pose)and I want to sculpt the inner mouth, so I use skeleton tool to switch pose to open the mouth and continue sculpting. And I switch pose to default pose. But I find, when I make visible or invisible this sculpt layer, the corners of the mouth that I never sculpt are different from original model. If I do the sculpt without using sculpt layer,it is ok.
So how can I use sculpt layer combine with pose tool?
Do anybody encounter this problem? How to solve it?
By the way, I'm using mudbox2014 and the skeleton i use is from XSI, not mudbox joint.

The image inside attachment shows : when I check visible layer or invisible layer, the areas(inside red marker) where I don't sculpt at all are changed.
[IMG]d3[/IMG]

could you post some images to show the problem... or do a video in mud...

I update the image

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