It seems Figma can’t decide whether it uses bullet characters (bad choice IMO) or real bullets, see for yourself:
If I start typing in the last line it converts the bullet char into a circular bullet, but I can’t fix the one in the second line. Sometimes even the bullet size is different. Look here: https://www.figma.com/file/k9PMkUzg426JX3nJjtkfE4/Buggy-bullets