bookmarks api questions

POSTed bookmark:

{  
   "type":"bookmarks",
   "id":"261",
   "links":{  
      "self":"https://ci-user-platform.conde.io/bookmarks/261"
   },
   "attributes":{  
      "amgUUID":"b62c708c-6572-4f5d-8587-06ac11549829",
      "siteCode":"EPI",
      "documentUrl":"http://ci.epicurious.com/recipes/food/views/test-bookmark-recipe-1491150888735",
      "bookmarkName":"This is a test bookmarkName for a test content item",
      "bookmarkTitle":"this is a test bookmark",
      "bookmarkMeta":{  
         "key":"value",
         "key2":"value2"
      },
      "createdTimestamp":"2017-04-02T16:34:32.000Z",
      "modifiedTimestamp":"2017-04-02T16:34:32.000Z"
   },
   "relationships":{  
      "bookmark-categories":{  
         "data":[  
            null,
            null
         ],
         "links":{  
            "self":"https://ci-user-platform.conde.io/bookmarks/261/bookmark-categories"
         }
      }
   }
}




GET for the same produces this (truncated bookmarkName and different relationships object)

{  
   "type":"bookmarks",
   "id":"261",
   "links":{  
      "self":"https://ci-user-platform.conde.io/bookmarks/261"
   },
   "attributes":{  
      "amgUUID":"b62c708c-6572-4f5d-8587-06ac11549829",
      "siteCode":"EPI",
      "documentUrl":"http://ci.epicurious.com/recipes/food/views/test-bookmark-recipe-1491150888735",
      "bookmarkName":"This is a test bookmarkName for a test content ite",
      "bookmarkTitle":"this is a test bookmark",
      "bookmarkMeta":"{\"key\": \"value\", \"key2\": \"value2\"}",
      "createdTimestamp":"2017-04-02T16:34:32.000Z",
      "modifiedTimestamp":"2017-04-02T16:34:32.000Z"
   },
   "relationships":{  
      "bookmark-categories":{  
         "data":[  

         ],
         "links":{  
            "self":"https://ci-user-platform.conde.io/bookmarks/261/bookmark-categories"
         }
      }
   }
}



PUT /bookmarks with this payload:

{  
   "data":{  
      "type":"bookmarks",
      "id":"297",
      "links":{  
         "self":"https://ci-user-platform.conde.io/bookmarks/297"
      },
      "attributes":{  
         "amgUUID":"b62c708c-6572-4f5d-8587-06ac11549829",
         "siteCode":"EPI",
         "documentUrl":"http://ci.epicurious.com/recipes/food/views/test-bookmark-recipe-1491154824369",
         "bookmarkName":"This is a test bookmarkName for a test content item",
         "bookmarkTitle":"this is a test bookmark UPDATED",
         "bookmarkMeta":{  
            "key":"value",
            "key2":"value2"
         },
         "createdTimestamp":"2017-04-02T17:40:06.000Z",
         "modifiedTimestamp":"2017-04-02T17:40:06.000Z"
      },
      "relationships":{  
         "bookmark-categories":{  
            "data":[  
               null,
               null
            ],
            "links":{  
               "self":"https://ci-user-platform.conde.io/bookmarks/297/bookmark-categories"
            }
         }
      }
   }
}

Yields this error:
{"data":{"errors":[{"title":"Bad Request","status":400,"detail":"\"value\" must be an object"}],"meta":null}}