Become a partner contribution "Services" multiselect form field can't be set

Contribution form at http://civicrm.org/join-partner-program (http://civicrm.org/civicrm/admin/contribute/custom?reset=1&action=update&id=62) uses Custom field "Services" http://civicrm.org/civicrm/admin/uf/group/field/update?reset=1&action=update&id=301&gid=48 which is set to use multiple options from http://civicrm.org/civicrm/admin/custom/group/field/option?reset=1&action=browse&gid=18&fid=157

None of these options appear in the browser on the initial screen, the confirmation screen does list them but they're all unselected.