After having corrected the  values, indeed, I'm getting this

But I thought I could get rid of was what the green arrows are showing, but after having experimented a bit with different lips masks, I found that something is wrong at the bitmap level because the shape of of lips is smaller than what is on the bitmaps, and it's a parameter that can't be changed using morphs.

Here I replaced the face bitmap by a simple color on the Lips material:

I Suppose that it's something that should be corrected on the bitmap, actually not doable by me  (already tried - lol)

Never mind, i'll live with this... "moustache"  Thank you anyway for your help.

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