You need to enable the collapse transformations layer swirtch on teh pre-comp...
As Mylenium says, you have to collapse transformations, otherwise AE will just treat the comp like any other video footage.
You seem to be missing the fundamental concept of what precomposing does. It probalby would be good for you to go through some foundational training so you can get an understanding of the main concepts of After Effects. Otherwise you will keep being frustrated by the basics and you'll never progress past tutorials and into creating your own content.