You can fix that by following these steps:
-
Place your cursor into the styles with blacked-out numbering.
-
Press
ctrl
+shift
+S
, then a popup will be showed up like the screenshot below -
Without changing anything, just press
reapply
button and your numbering will be back to normal again. -
If not, you must remake again your multilevel list
find out more at this youtube video below: source: https://www.youtube.com/watch?v=FDrRxYAi6Is