Disappearing Scenery Objects

Why is it that some objects seem to disappear after being placed in a route. I am currently working on a semi-fictional route and after I do some editing and go back, the object is no longer visible!!! What is even more frustrating is when I hover over where the object was, the object highlights and re-appear....but only when I hover over it!!!
If I delete the object and replace it, it then seems to stay without any further issue. Stranger yet, if I place a new object near the invisible object, it reappears!
WHAT THE HELL IS GOING ON!?!?!?!?!

If I delete the object and replace it, it then seems to stay without any further issue. Stranger yet, if I place a new object near the invisible object, it reappears!

WHAT THE HELL IS GOING ON!?!?!?!?!