Redirect to a new site isn't working

Hi,

I’m trying to redirect posts to a new website (each post to it’s new location on the new site). The result is actually like I’m redirecting to a subfolder. I’m getting something like this:

The redirect:
from:
/post1
to:
http://www.newblog.com/myblog/post1

But when I go to:
http://www.oldblog.com/post
I’m getting the following
http://www.oldblog.com/post1myblog/post1

Like that, without even a slash and of course without going to new url. Any idea?

Thanks

https://wordpress.org/plugins/redirection/