Confluence not respecting the formatting settings

Steps to reproduce:

1. Add a line of text. (Type anything.)
2. Make it a header, e.g. h2.
3. Send a carriage return to create new line of text above the header. (This line should have paragraph formatting by default.)
4. Before you enter any text on this new line, press delete. This should move the header text up one level, into this line.
5. Confluence lists the formatting of the header as "Paragraph", and the line of text no longer has spacing above the text like it would if it were a header; however, the text is still the same size as it was when it was a regular line of header text.
6. Examine the Table of Contents macro. (Create a new one if needed.) You'll see that the malfunctioning header line appears in the TOC as if it were still a header; however, it appears in a larger font within the TOC itself, which is not normal.