Character of Blender To Unity Deformation on Mesh

I am having a very serious problem
I painted my character perfectly in blender
and when I’m animating my character in unity
the mesh begins to deform
from what I know, I’m not doing anything wrong
and the unity is a little crazy
anyone ever had this problem?

image:

Unity only supports up to 4 bones per vertex. How many bones are actually used is determined by your Quality-settings (see blend weights). So you either have more than 4 bones per vertex in your blender model, or your quality setting might only use 2 or 1 bone.

thanks very much brother
problems resolved