Ok thanks for your help, you put me on the line.

if somebody knows for the matrices !...

Without going into theory/details: when it comes to matrices A * B != B * A. If your matrix is different (row vs column) then multiplication order is reversed, you can also reverse it by transposing all matrices.

Ok but here I perform the multiplication in the same order, with the same matrix but transposed once and the other time not transposed, so I don't understand why it works here and with the same processing not ?

// these two are equivalent
output.RTposition = mul( input.position, transposedView ); // transposing reverses order
output.RTposition = mul( view, input.position ); // judging by your projViewWorld matrix this is correct order

// if those lines are correct, then this one is wrong order
output.RTnormal = mul( input.normal, view );