Why are these lines like that?

[Deleted member 4716251]

Why are these lines like that?

 

[Winterfire]

Why are these lines like that?

The yellow is the highlight, it means you have that model selected.
The other lines are the Bounding Box.
Neither show up in renders, so it is nothing you should be worrying about.

 

[Deleted member 4716251]

I solved the problem. Thank you.