For the Ubuntu maintainers: The Maemo package is based on the Ubuntu package, and the Ubuntu-specific patches (especially "spring2.patch") have been left in the package, so it's related to the Ubuntu package as well.
From what I can see from the source, "spring2.patch" adds the changes for the "rubberband effect", so it probably is a bug in that patch.
For the Ubuntu maintainers: The Maemo package is based on the Ubuntu package, and the Ubuntu-specific patches (especially "spring2.patch") have been left in the package, so it's related to the Ubuntu package as well.
From what I can see from the source, "spring2.patch" adds the changes for the "rubberband effect", so it probably is a bug in that patch.