Hello!

I have a trouble with drawings. I have the model of frame that has a few welded places. When I'm trying to make an isometric view in drawing (pict 1) and add the caterpillars of welded places - appears the problem with their viewing: the caterpillars that are located closer to me (p. 1.) display ok but caterpillars that are locate a little bit behind (p. 2.) - display like they are intersecting the model. I tried to make another isometric view but had the same problem. Could anybody help me?