Frontpage redirects to frontpage ??

I believe there is a bug In Polylang. I use latest free polylang, latest WP, latest Yoast Pro. The developer from Yoast believes that this must be a polylang problem.

What happens is this:
I create a new blog post in a ceategory that is shown on a subpage. When I publish the post all of a sudden the frontpage of the webpage is redirectet to this post !!

What I then do is unpublish the post, deactivate Polylang, Publish the post again and activate Polylang again. Then the problem is gone. But this happens every time a new Blog post is made !! Can you please fix this.