Selection lists are not showing all records

I have code that opens a selection list based on a relationship, the code looks like this

find_customers: function () {
          var self = this;
          var model = self.model;
          var linkModelRelName = 'accounts_in_customers_1';
          var contactBean = app.data.createBean('Contacts', {id: this.model.get('id')});
          var related_collection = contactBean.getRelatedCollection('accounts_contacts_1');
          related_collection.fetch(
               {
                    relate: true,
                    success: _.bind(function (attributeData) {
                         var account = attributeData.models;
                         var accountID = account[0].get('id');
                         //var accountBean = app.data.createBean('Accounts', {id: accountID});
                         var pt = app.data.createBeanCollection('IN_Customers');
                         pt.setOption('endpoint', function (method, collection, options, callbacks) {
                              var endPoint = 'Accounts/' + accountID + '/link/accounts_in_customers_1';
                              var url = app.api.buildURL(endPoint);
                              return app.api.call('get', url, null, callbacks);
                         });
                         app.drawer.open(
                              {
                                   layout: 'selection-list',
                                   context: {
                                        module: 'IN_Customers',
                                        parent: 'Accounts',
                                        model: self.createLinkModel(model, linkModelRelName),
                                        collection: pt,
                                   }
                              }, _.bind(self.recordSelected, {
                                   model: model
                              }));
                    })
               });
     },

There are 4 records that should be shown but I only ever get 2 back.

Selection-List

If I click on more records, it changes the count to 2 or 37043 but adds none to the screen.  I have checked all tables and other places this relationship is exposed and I always get 4 records.  It is just with thsi code that it returns the wrong number.