Hi,
Will deleting the wrongly extended part of the road not work ? Could
you please post a link of the feature that you would like to shorten
so that I may give a contextual reply. You can post a link by going to
that place in mapmaker and right-clicking "Link to this page"(On the
top right corner) and selecting "Copy Link Location"(Firefox) or "Copy
shortcut"(Internet Explorer) and paste it here while you post.
Regards,
Map Maker Guide.