Version Picker custom field type ordering

We use the fix version field and I also created two custom fields of type version picker called "Required Fix version" and "Proposed Fix Version". For some reason the ordering of these two custom fields is NOT the same as fix version field in the Create Issue or Edit Issue screen.

In the fix version field, the Unreleased versions are at the top, but in the custom fields I created, the Unreleased versions are at the bottom. If all the version fields are getting values from the same version ordering I have in the Manage version section, then why is the ordering different in the screens.

Any help is appreciated.

Thanks.