Thanks Sha and Aran,
Thank's a lot for your explanations on 301 redirects
I see a line of code in the htaccess file (RewriteBase /) that is probably doing the 9 first redirects that I mentioned
To avoid the rest, I just exported the pages and posts, deleted all of them and imported the xml file again. Maybe this fixes it. I understand it's not important but I'd rather have them disappear.
But appart from that, before importing the file I changed the
David