I have a drawing with different lines and layers. All the layers are visible and all objects unhidden. However some of the lines are visible on the screen for some reasons. If I do select all the objects will appear selected and would be visible (yellow), If I deselect the items won’t be visible again. This is the first time that this happens to me. Do you know how to sort out this problem???? I’m desperate!!!
Many thanks in advance

Many thanks in advance