Display Suite module is not displaying field labels
The page you see is from the "Default" Manage Display. Make sure you use this instead of others. The Display Suite layout is based on per content type, not per node. To change the Default display, you should go to "Structure > Content types > Your content type > Manage display" or "Strurture > Display Suite > Manage display(your content type)".

=== Update: June 25, 2015 at 8:37am - screenshot for @Kaimei Wang ===