Hi Blaz, this question never stops getting asked. In fact, it is asked so often that I just started merging all the threads that asked this question together and created a thread named, Thread #1,000,000 about the pre-open! and have made it a "sticky" thread in this very forum.
The phenomenon you refer to is called the "pre-open" and you will find an easy to understand explanation in the thread I linked to.
If you have any questions, just ask.
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