What did you expect to happen:
(1) The second bullet is not shown as a bullet but as an apostrophe; or
(2) It may work as only the second bullet remains, while the first one is not shown.
Try using the escape backslash \- before your second dash,
that should prevent this fron happening.
If you wanted indented (nested) bullet in your list, use the indent button instead:
It seems to behave in the same way here in the forum’s markdown editor:
Markdown in code block:
- bullet point
- - dash space dash space
- dash space
- 4 spaces dash space
- same as above
- - dash space dash space
- - - dash space dash space dash space
- dash space
Markdown list parsed:
bullet point
dash space dash space
dash space
4 spaces dash space (indented with 2 spaces works too)