System -The text background colour area is not displayed the same way between EasyRPG and RPG_RT

[Mimigris]

Player platform:

Windows, 64 bits continuous build of the Player.

Attach files (as a .zip archive or link them)

Example system graphic to illustrate the issue.

System.zip

Describe the issue in detail and how to reproduce it:

Between the RPG_RT and EasyRPG, it seems that the colours used in the text background colour area are not displayed in the same way.
For example here, you can notice that the shadow of the text is mostly white and orange in EasyRPG while it it is mostly white in the RPG_RT.