Testing version:
iOS 11093
Mac 11015
What were you doing: created a heading on empty line after a single line return from line with text
What feature did you use: iOS: used heading option on iOS menu; Mac: typed Command 4
What happened: the line above the new heading line (regular text) turned into a heading - To add a heading one line after an existing line of text, I have to add two line returns, enter heading, then delete one of the line returns
What did you expect to happen: create heading on new line and have previous line remain the same