Inconsistency in measurement in Autocad 2013

[Anonymous]

Hi There,

I'am using AutoCAD 2013 and while iam measuring objects in model space, I obtain a different measurement between the same parallel lines.

See attached pics. The first one is showing a wierd measured dimension value and I then I have to try a few attempts before getting the correct dimension.

Could some one help me with this issue? Is there some setting that I need to do in measurement options?

[Patchy · Accepted solution]

Same elevation for both lines?

LIST each line and see.

[Anonymous]

Just found out that these are 3d lines. This drg was made in archi cad or autocad3d or other software. Now I need to get all the objects on a current zero layer to commence my work. 

What is the right procedure to do this?

[Patchy · Accepted solution]

Use CTRL+A to select them all

Then CTRL+1 to get Properties Palette to show up

Then click to change them to layer zero.