I have a section view in a drawing in SW2017 SP4.1

I'm sure someone has had this question before but I couldn't find anything in search.

Part A and B show the color of the part in the non-sectioned area and white on the sectioned area.

Part C shows the color of the part in both areas.

Is there any rhyme or reason to this.?

Can I make all the parts behave the same way?

Thanks in advance for any help.