Weld tool issues when attaching head to body

#1

Hello,

I do not understand why I’m unable to attach a head to a body after connecting them and welding the points.
My mesh turns out very weird.
What am I doing wrong?

See screenshot below:

Capture%20d'%C3%A9cran%202023-05-31%20153750
Capture d'écran 2023-05-31 153750.jpg1556x986 274 KB

Thank you for your help,