Room lines stills on my pcb and the top layers tracks are not displayed in 3D view, Altium
If I am understanding you correctly, these lines that can be seen in your screenshots are DRC error markers showing unrouted connections. They are left over from when your parts were not placed or routed. You need to run the DRC again to remove them. 

As for viewing top and bottom layer traces in 3D view, by default I believe the top layer soldermask is 0% transparent, meaning the tracks are not visible beneath it. The bottom layer soldermask, on the other hand, generally has some transparency (10-20% perhaps) so you can see the tracks. All you need to do is go into the View Configurations tab when in 3D mode and adjust the Top Solder Mask slider.