Bus missing in Constraint Manager

Hello everyone,

I'm using DE HDL with constraint manager. There are two buses in the schematic, Data<31..0> and ADDR<12..0>. When I launched Constraint Manager, in ther Net worksheet, Constraint Manager recognised Data and ADDR as bus objects, but there was just one bit under the ADDR bus, ADDR<0>, other bits ADDR<1> to ADD<12> were missing.

I tried to modify the .dcf file in the constraints directory, and  add the ADD<1>--ADD<12> manully to the ADD bus. After the design was packaged, they were still missing.

 Please give me some advice to fix this and how this happened.