i was facing the error of symmetrize and mirror axis. I try manything to fix it but it doest work. i also try too duplicate the same object with same position, after that i go on sculpt mode to see that symmetrize work but it does the same thing. i try the duplicate cuz the mirror doest work and it do the opposite possition. Also the symmetrize point on the same axis x- (not on x+,x-). it was think that symmetrize point should be on different point (x+,x-) but it doest.
Mirror error
symmetrize point error
here the link file if u want to see > here