Why did my white text turn Blue for only one category?

On the calendar:
https://www.publicaffairsjobs.com.au/learning-centre/training-calendar/
..all my social media events (pale red) now have blue writing - despite it all being selected as white (prev CSS supplied).

The only new CSS is some provided by Vinod for making public holidays not show the booking information.

The site should be open to support.