General ⇒ How to eliminate the last numbered area title in the header?

[viper123]

I'm composing a book with a few parts and areas, and I'm utilizing the extravagant her bundle to modify the header. Every section closes with an uncommon unnumbered part for activities and answers. That activities part has appeared in the ToC as an unnumbered section. The MWE code underneath shows this. Everything turns out great, yet I saw a glitch yesterday: in the activities and answers part, the header is indicating the last area title (see the last page of the accumulated code). This shouldn't be the situation. I might want to transform it for the current unnumbered segment title, for example, "Answers to issues" (without numbering). So how to do that?

[Ijon Tichy]

I'm utilizing the extravagant her bundle

Where can I find this bundle?

The MWE code underneath

Where is the minimal working example?

see the last page of the accumulated code

Which code?