I was looking at one of my courses, and I noticed that an ordered (numbered) list in one section restarted the numbering at zero (see with 1.5em.png). I was using nimble style, and tried changing to arialist, but got the same results. Using the CSS inspector in Safari, I looked at the css styles for the list, and narrowed it down to the following css.

ul, ol {
margin: 0 1.5em 1.5em 1.5em;
}

I was not able to find anything like that in the arialist or nimble style, so I searched the base styles and found that editor.css and text.css in the canvas base style had that code. Using the CSS inspector, changing the last number (left margin) to 2em was enough the give a sufficient margin for a 2 digit number for the list.