How to reproduce:

1. user bob own a host that belongs to Location A and Organisation B
2. edit bob, verify that the location A and Org B are pre-selected and greys out
3. edit something, say 'surname' and save
4. bob disappeared from location A and organisation B, and he shows up in the mismatch report

it seems the when the user's location and org multi-selectbox is disabled, the pre-selected values didn't made their way into some hidden field.

feasible patch:

diff --git a/app/views/users/_form.html.erb b/app/views/users/_form.html.erb
index 6c28beb..e2fc195 100644
--- a/app/views/users/_form.html.erb
+++ b/app/views/users/_form.html.erb
@@ -56,7 +56,8 @@
         <%= location_selects(f, @user.used_or_selected_location_ids,
                              { :disabled => @editing_self ? Location.pluck(:id) : @user.used_location_ids,
                                :label    => :none } ,
-                             { :onchange => 'taxonomy_added(this, "location")' } ) %>
+                             { :onchange => 'taxonomy_added(this, "location")',
+                               'data-useds' => @user.used_location_ids.to_json } ) %>
       </div>
     <% end %>

@@ -65,7 +66,8 @@
         <%= organization_selects(f, @user.used_or_selected_organization_ids,
                                  { :disabled => @editing_self ? Organization.pluck(:id) : @user.used_organization_ids,
                                    :label => :none },
-                                 { :onchange => 'taxonomy_added(this, "organization")' } ) %>
+                                 { :onchange => 'taxonomy_added(this, "organization")',
+                                   'data-useds' => @user.used_organization_ids.to_json } ) %>