Solution/Module is not displayed correctly - Web SDK

Dear All,

I am working on Solution Wizard with Web SDK. I successfully created 2 modules, CU and SG. But the only problem is the modules is not displayed correctly.

SG module is not showed in the navigation menu. But the content of SG modules is displayed in CU module while the content of CU module is not showed at all.

The customize navigation menu screen as below:

I assumed when I create 2 modules, both of the modules should be displayed. 

Please help. Your assistance is much appreciated.

Thank you.