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Hello Senthur !
First of all, this is the mobile "vertical" video. You may correct the height of the future videos via editing the record in the `sys_transcoder_filters` table. The bold number in the following code means the height of the videos there:
INSERT INTO `sys_transcoder_filters` (`transcoder_object`, `filter`, `filter_params`, `order`) VALUES
('bx_timeline_videos_mp4', 'Mp4', 'a:2:{s:1:"h";s:3:"318";s:10:"force_type";s:3:"mp4";}', 0),