140% doesn't seem to be enough. Try line-height: 2em; If you are trying to create space betweem list items, this is the wrong approach and you should use something like:

ol li {
    margin-bottom: 0.5em;
}

It would be best to add this to your template stylesheet as a css rule, which you can then apply as a Style to the ordered list, eg:

ol.list-space {}

ol.list-space li:nth-child(n+2) {
    margin-top: 0.5em;
}

Only is W3 wrong??

https://www.w3schools.com/css/tryit.asp?filename=trycss_line-height

No. The default line-height of your site is already set to 1.5 which is 150%.

Using line-height to create space between lists is not the best solution, and it is better to uses margin, as you have now done.