get /projects/{id}/trackers is returning one less tracker then what is defined in the project. In attached images please note there are 11 trackers in the web interface.

Bugs ( 0 total ) Epics ( 2 open / 2 total )
Features ( 9 open / 9 total ) 
Kanban Tasks ( 0 total ) 
Project Charter ( 1 open / 1 total ) 
Releases ( 0 total ) 
Request New Feature ( 0 total ) 
Sprints ( 0 total ) 
Stories ( 11 open / 11 total ) 
Tasks ( 17 open / 17 total ) 
Testing ( 5 open / 5 total ) 
In the REST API it only returns 10 trackers 
Bugs
Epics
Features
Kanban Tasks
Project Charter
Releases
Request New Feature
Sprints
Stories
Tasks
We are missing the last tracker: 
Testing

JSON

[
   {
      "id":179,
      "uri":"trackers/179",
      "html_url":"/plugins/tracker/?tracker=179",
      "project":{
         "id":111,
         "uri":"projects/111",
         "label":"IBN-EMP Sales Order Entry Pad"
      },
      "label":"Bugs",
      "description":"Bugs Tracker",
      "item_name":"bug",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":{ },
      "resources":[ ],
      "color_name":"fiesta_red"
   },
   {
      "id":180,
      "uri":"trackers/180",
      "html_url":"/plugins/tracker/?tracker=180",
      "project":{ },
      "label":"Epics",
      "description":"Epics are a collection of features.\r\n* Logical Grouping of Features",
      "item_name":"epic",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":{ },
      "resources":[ ],
      "color_name":"plum_crazy"
   },
   {
      "id":181,
      "uri":"trackers/181",
      "html_url":"/plugins/tracker/?tracker=181",
      "project":{ },
      "label":"Features",
      "description":"Features - Are services provided by the system that fulfill stakeholder needs. In most cases a Feature should be a testable function independent of the full project.",
      "item_name":"feature",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":{ },
      "resources":[ ],
      "color_name":"deep_blue"
   },
   {
      "id":182,
      "uri":"trackers/182",
      "html_url":"/plugins/tracker/?tracker=182",
      "project":{ },
      "label":"Kanban Tasks",
      "description":"A tracker of tasks for kanban",
      "item_name":"kanbantask",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":null,
      "resources":[ ],
      "color_name":"inca_silver"
   },
   {
      "id":183,
      "uri":"trackers/183",
      "html_url":"/plugins/tracker/?tracker=183",
      "project":{ },
      "label":"Project Charter",
      "description":"Project Charter defines the detail and objective of the project. There are 2 section defined for clients approval:\r\n\r\n1. \"Project Charter\" to captures the vision of the Client\r\n* Provides a Vision of project\r\n* Goals and Dependencies\r\n* Scope both In-Scope and known Out-of-Scope\r\n* Known Constraints and Known Risks\r\n* Agreement to move forward with \"Project Plan\", \"Discovery\" and to pay the cost of doing so\r\n\r\n\r\n2. \"Project Plan Estimation\"\r\n* Discovered Constraints and Discovered Risks\r\n* Create Features list\r\n* Define Epic Stories\r\n* Layout User Stories\r\n* Estimate Tasks and assign hours to each Tasks\r\n* \"Project Plan Sign Off\" agreement to begin and pay the cost",
      "item_name":"Charter",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":null,
      "resources":[ ],
      "color_name":"clockwork_orange"
   },
   {
      "id":184,
      "uri":"trackers/184",
      "html_url":"/plugins/tracker/?tracker=184",
      "project":{ },
      "label":"Releases",
      "description":"releases",
      "item_name":"rel",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":null,
      "resources":[ ],
      "color_name":"sherwood_green"
   },
   {
      "id":185,
      "uri":"trackers/185",
      "html_url":"/plugins/tracker/?tracker=185",
      "project":{ },
      "label":"Request New Feature",
      "description":"Request a New Feature to be added to the product or solution.",
      "item_name":"request",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":null,
      "resources":[ ],
      "color_name":"chrome_silver"
   },
   {
      "id":186,
      "uri":"trackers/186",
      "html_url":"/plugins/tracker/?tracker=186",
      "project":{ },
      "label":"Sprints",
      "description":"sprints",
      "item_name":"sprint",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":{ },
      "resources":[ ],
      "color_name":"acid_green"
   },
   {
      "id":187,
      "uri":"trackers/187",
      "html_url":"/plugins/tracker/?tracker=187",
      "project":{ },
      "label":"Stories",
      "description":"User Stories",
      "item_name":"story",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":{ },
      "resources":[ ],
      "color_name":"lake_placid_blue"
   },
   {
      "id":188,
      "uri":"trackers/188",
      "html_url":"/plugins/tracker/?tracker=188",
      "project":{ },
      "label":"Tasks",
      "description":"task",
      "item_name":"task",
      "fields":[ ],
      "structure":[ ],
      "semantics":{ },
      "workflow":{ },
      "parent":{ },
      "resources":[ ],
      "color_name":"flamingo_pink"
   }
]