It looks like flows.nodered.org is handling Markdown formatting differently than GitHub and npmjs.com. For example, the readme file for https://github.com/rsenden/node-red-contrib-map is displayed correctly on both GitHub and on https://www.npmjs.com/package/node-red-contrib-map, but parts of the list entries are incorrectly displayed as code blocks on https://flows.nodered.org/node/node-red-contrib-map.
I guess this may be due to leading spaces within those list entries. I could easily fix this in a new version of the plugin, however it would make more sense if flows.nodered.org would handle the Markdown formatting the same as GitHub and npmjs.com.