Андрей, большое спасибо за ответ!
А ведь действительно, может там стоит loop и 2 элемента он понимает как зацикливать, а один нет?
Вот результат проверки:
Array
(
[ID] => 18
[TIMESTAMP_X] => 2019-04-21 01:53:52
[IBLOCK_ID] => 1
[NAME] => Видео объекта
[ACTIVE] => Y
[SORT] => 630
[CODE] => OBJ_VIDEO
[DEFAULT_VALUE] =>
[PROPERTY_TYPE] => F
[ROW_COUNT] => 1
[COL_COUNT] => 30
[LIST_TYPE] => L
[MULTIPLE] => Y
[XML_ID] =>
[FILE_TYPE] =>
[MULTIPLE_CNT] => 5
[TMP_ID] =>
[LINK_IBLOCK_ID] => 0
[WITH_DESCRIPTION] => N
[SEARCHABLE] => N
[FILTRABLE] => N
[IS_REQUIRED] => N
[VERSION] => 1
[USER_TYPE] =>
[USER_TYPE_SETTINGS] =>
[HINT] =>
[PROPERTY_VALUE_ID] => Array
(
[0] => 471
)
[VALUE] => Array
(
[0] => 501
)
[DESCRIPTION] => Array
(
[0] =>
)
[VALUE_ENUM] =>
[VALUE_XML_ID] =>
[VALUE_SORT] =>
[~VALUE] => Array
(
[0] => 501
)
[~DESCRIPTION] => Array
(
[0] =>
)
[~NAME] => Видео объекта
[~DEFAULT_VALUE] =>
[DISPLAY_VALUE] => Загрузить
[FILE_VALUE] => Array
(
[ID] => 501
[TIMESTAMP_X] => 23.04.2019 20:54:16
[MODULE_ID] => iblock
[HEIGHT] => 0
[WIDTH] => 0
[FILE_SIZE] => 11069444
[CONTENT_TYPE] => video/mp4
[SUBDIR] => iblock/526
[FILE_NAME] => 52627d2bccc84b0b2f9c7da5f2263cc3.mp4
[ORIGINAL_NAME] => IMG_0363.mp4.mp4
[DESCRIPTION] =>
[HANDLER_ID] =>
[EXTERNAL_ID] => f40652ee0fced61e16f6ba9fa1e022a4
[~src] =>
[SRC] => /upload/iblock/526/52627d2bccc84b0b2f9c7da5f2263cc3.mp4
)
)