Problem with RSS feeds

Hello, I’ve a big problem I can’t resolve.

My feed only show a summary of my articles, instead of complete text (like this : image), but :

– I’v checked the option “complete text” in the admin panel
– I don’t use <!–more–> tags
– I’ve set Feedburner option for complete text also
– The Full Feed Text plugin is installed, but don’t change anything

I don’t understand what is wrong, can you help me please ? Thanks