Tab Group Color Issue on Zen Browser but Not on Floorp

[lmBored]

Hi, I've just switched from Floorp to Zen, but I'm seeing an issue that Sidebery is assigning the same color to most of my tab groups only on Zen Browser. I have five groups, and all of them are purple, as in the image below. And this issue doesn't occur on Floorp, even though I use the same settings on both browsers. Is there a way to resolve this or customize the colors better? So that each group has a different colors.

In addition, I would really appreciate if someone can share how sidebery colorize groups. Thanks a lot!

This is sidebery on zen browser:

And this is that on floorp:

And this is my setting on colorizing tabs/branches: