This comes from Genome Light's colors. It is a slight adjustment to Breeze Light. Genome Spite is also included.
This color scheme is used in Spectrum Light
Have you tried turning it off and on again? Sometimes plasma assets will not update and some may still be themed according to something you previously had set. This can usually be fixed by restarting.
To restart just plasmashell, open KRunner with "Alt + F2" to execute the following 2 lines: