STR:

1. Load AMO dev and go to View My Profile , make sure your account displays content for "Extensions by", "Themes by" and "My reviews" sections.
2. Click Edit profile and update your username.
3. Observe the profile page.

Expected result:
All sections are displayed.

Actual result:
Only "my reviews" is visible.

Notes:
After refreshing the page all the sections are displayed.
It is not reproducible when editing the display name.
This issue is reproducible on AMO dev and AMO stage with FF61(Win10).