Weird shapes

[Ran lll]

Hello, I'm new here and I hope I'll find kind people here
I'm kind of newbie in 3Ds Max so I still try to learn and understand some things but I need help in this one.. On screenshots the corners of that figure are different, two are somehow concave, and two others are normal. How do I fix that so they will be identical ? I want some figures to be fully symmetrical and this makes problems Can you please help me figure this one out ?
Screens:

[Tony O'Connor]

are you talking about the back LT side where the hole is i would select all them edges and cap them or move the vertex's up so they match up then weld them together

[Ran lll]

Thanks to you I started to look over options and found a solution, just connect the vertexes Thanks very much this solved much problems.

[Corey Beaulieu]

Glad you figured it out.

In the future though, always make sure your vertex are "welded", normals are oriented uniformly. and that if you are going to use the Bevel/Chamfer/Extrude/Etc functions in Edit Poly, that you choose the right normals: Group/Local/Polygon.

Also, if you are simply looking to make a perfectly symmetrical object, then consider deleting one half of the object, model until your heart is content, and then add a Symmetry Modifier to the object and adjust the mirror to the halfway point.