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.

𝒫𝒽𝓎𝓁

---

(っ◔◡◔)っ

👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sequoia 15.2, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️