Please check if your "Current setting of using nicknames" is in the state of "valid".
You can check it through this way below.
1. Select "User Management" on the left column.
2. Select "Create a New" on the user list page
3. Check "Current setting of using nicknames" state on the user editing page.
If the "Current setting of using nicknames" is invalid, your "Login ID" or "full name" will be shown on App.
*If you didn't enter your Full Name your Login ID will be shown. If you did, your Full Name will be shown.
*Please inform us if you want to change the state of your Current setting of using nicknames.