PR doesn't update with last branch changes

I created a PR (https://bitbucket.org/spyder-ide/spyderlib/pull-request/30/correctly-decode-string-code-after-pep8) from a branch (https://bitbucket.org/Nodd/spyderlib/branch/pep8_encoding), and updated the branch afterwards. My problem is that the PR is not updated with the modifications.
It seems that it is not linked to the correct PR but I can't change that. It shows an old PR where I wrongly choose the local repo instead of upstream.