Mirror Modifier - bad result

Support Modeling
1

Hello,

Everything that i try to use mirror give me a bad result:

upload.png1325×584 132 KB

How i can fix it?
Thanks!

2

Are you using multiple modifiers?

Supply a demo blend file as the info supplied is insufficient

3

No, there no others modifiers in this mesh.
You ask for a blend demo file?
Sry for my bad english

4

Yes, just an image is pretty much worthless

5

upload.png778×437 86.2 KB

There is, thank you in advance.

6

I think I realized where the error is.
there a option called “Auto Smooth” in “Data” tab, i am right?

1.jpg800×352 48 KB

2.jpg800×352 45.6 KB