1.How can you save the modified properties of headings since they revert to default on each new document?

2.Headings sometimes register as headings and sometimes they don't, so when you are scrolling down the document it doesn't say on which part you are, just the part of the last registered heading...

There is no discernible difference between registered headings and headings that just look like headings. I did the exactly same thing in both cases. Why does this keep happening?
How can you make headings to be headings?