Did a quick search, but couldn’t find a topic on this.
In the lessons in level 21, wrong background colors is used in several of the vocabulary and radicals. This is only when being presented them the first time, in the review, the colors are correct.
Didn’t note down all of them, but radical 番、平、角、半 (at least) have the background color for vocabularu,
And Kanji 務、査、総、件、権、設、派、 have the background color for radicals.