Objects do not Stay Where I Place Them In IS3

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Hi,
 I don't understand what the problem is but every time I place a ground marking that shows the gate location, such as replacing C39 for C32 using IS3, the marking has moved and shifted a foot or so, and reveals some of the markings below it. They were placed precisely where I first placed it, but when I go back and launch the simulator again, it runs the index building a data base again, and that's when the object has shifted. Why is it doing that? Should it not stay precisely where I placed it in the first place? If IS3, cannot do that, I don't find it to be a very precise placement software. I thought it was suppose to do a better job when placing an object. Another problem I find with IS3 is that when I go back and need to make a change or something with an object that I've placed previously, it won't allow me to select that object. It wants to replace it by placing another, same object, over the one I've already placed previously. I shouldn't have to go back and move the object back to where it was place the first time in the first place.  
See the screenshot below:

As you can see, everything lines up and the white squares line up nicely.

Now see the image below:

As you can see, it has shifted to the north and to the left, and it also reveals some of the C32 that is below it.

Ken.