214: Alignment for expandable-section break

Colons, optionally combined with single dots, are interpreted as alignment marks at the start of a block. In your case they are followed either by three literal plus signs +++ or two literal plus signs separated by a space + +, which mark the end of an expandable section or subsection respectively. But expandable-section breaks can not be aligned, since they are not represented by a visible element in a webpage.

Solution

Remove the alignment markup from expandable-section breaks, because these are not represented by a visible element in a webpage that could be aligned.

If you did not mean to mark the end of an expandable section but want to align three literal plus signs +++ or two literal plus signs separated by a space + +, then prepend the plus signs with a backslash. The following example centers three plus signs:

.:. \+++

If you did not mean to align content and instead wanted to print literal colons/dots at the start of a paragraph, then mark these as literal by prepending a backslash. For example: \.:.