About Update Reject From Google

I have acc with more 10 apps. Yesterday, I received notify that : need update "Pricing & Distribution" of one of my apps. And after update I receive email reject update with reason : Your app's title shouldn't use other products' branding or names at the start of your app title without permission. This implies association and can be misleading for users. Instead, use "for [ product or brand name ]."

I have some questions :
+ Why I just update Pricing & Distribution, GG reject me about title. Maybe GG will check everything in my app when I update ?
+ Update "Pricing & Distribution" is mandatory or not?

What should I do? I hope someone can help me answer this questions.