Is bossbar color kinda switched between blue and purple?

because the color from command feedback when I set the bossbar color blue it's kinda purple and when I set it to purple it's really dark blue and when I display it, it show the same color as the command feedback

How to reproduce

1. /bossbar add purple "purple"
2. /bossbar add blue "blue"
3. /bossbar set purple color purple
   → The bossbar name appears blue in chat
4. /bossbar set blue color blue
   → The bossbar name appears purple in chat