Hi Bruno,
Based on my analysis, below I have listed few major reasons for why Google generating its own title tag for your pages in SERPs.
- Missing Title Tag
- Title Tag is Lengthy
- Title Tag is Too Short
Source: http://pparthipan.blogspot.in/2011/09/is-google-ignoring-title-tag-in-serps.html
Thanks,
Parthipan.P
