Why does bunpro sometimes let you correct and sometimes just mark it wrong?

[airbus29]

For some questions when doing reviews, if you forget the の after a noun, it just marks it as yellow and lets you fix it without making it incorrect. But for some questions, if you forget the な after a な adjective, it just marks you wrong automatically. I would understand if it was all one way or all another way, but the mixing and matching somewhat confuses me

Example of letting correct:

example of not letting correct:

[Noxsora]

I think of orange as bunpro’s equvilent of partical credit. You can correct red ones anyway if you like.