i shouldn't answer cause your rude but....
dreamflower answered your question,
IF YOUR OBJECT EXISTS THEN YOU ARE LOOKING IN THE WRONG PLACE FOR IT OR IT IS TOOO DAMN SMALL OR IT IS TOO DAMN BIG
your program displays objects in the order that you place them, first ones first and last ones last, then sets your camera (what you see on the screen) to your last image, so the last object placed is where your camera is positioned and what you see, unless you position your camera manually
objects are positioned from the center of the object, so the size of your object matters greatly where they will be positioned on your screen so if your object is too small or too large it will not be positioned proportionally to your other objects
now shut the hell up (-: (i hope you know i'm kidding)
My advice is free -
unfortunately you get what you pay for (-: