Lost customized "Default Column Layouts" settings

Description
Customized "Default Column Layouts" Global configuration is Lost when performing operations on the "Miscellaneous" Admin page.

How to reproduce

1. Customize the "Default Column Layouts" sections:
   
2. Head into the "Miscellaneous" admin page, and press "Save" (no need to input any change):
   

Actual result/Attachments
The following sections will lose the customization:

• Test Execution TestRun Columns;
• Test TestRun Columns;
• Test Set Test Columns;
• Test Plan Test Columns.
  

Expected result
The customization of the "Default Column Layouts" sections is kept.