If your blog is
kristofmollu.blogspot.com , then you have done something quite different in your posts this month.
instead of a normally uploaded image.
All your other posts are filled with junk Word formatting as a result of you copy&pasting content directly from
Word into Blogger post editor.
is currently ~1100 KiB , just above maximum allowed size for Feedburner , not to mention
nearly an order of magnitude larger than an average Blogger feed.
Replace the image, reset the junk formatting, and then follow the instructions
and provide Feedburner with an Original Feed with fewer posts or only
a summary feed to begin with.
In the future , use plain Notepad to paste from, or paste using Ctrl+Shift+V , not Ctrl+V
to paste (when using Chrome or Firefox on Windows)