Don't display special symbols

Steps to reproduce:
1. Save following text:
bla bla bla
<? bla ?>

2. Into MySQL saved text:
<p>bla bla bla<br />&lt;? bla ?&gt;</p>

3. When load in CKE- view next text:
bla bla bla

<? bla ?> - don't exsist;

5. But into textarea "<? bla ?>" - exist!

WHY??