When we build templates we always create a style for bulleted and numbered lists. We are often asked why we don’t use the bullet button on the Home tab of the ribbon.The issue is that we can’t control it. You can make changes in an individual document but by Microsoft’s own admission they aren’t retained in a template or are potentially lost when you close and re-open Word.
The result is that you get irregular styling of bullets so they might not come out in the colour, size or with the indent you’d expect. It’s the same with numbered lists.
For a fuller explanation you can look at this page on the Microsoft Office support site