I have a document that has some paragraphs formatted with a seemingly unchangeable first-line indent. In paragraph format, the left indent is zero, and first line indent is "none". When turning on "show paragraph marks", a tab character appears in the indent area. However it is impossible to delete the tab. It acts like it is the newline, and merges the text with the previous line if backspace used at the start of the line.
Setting the format to Normal does nothing. Clear Formatting does nothing.
This problem occurs on the line after a Heading 1 style. The properties of Heading 1 have "Normal" for style for following paragraph.
Inserting text elsewhere in the document does not exhibit this problem.
What is the cause of this "phantom tab" and how do I eliminate it?