Your canvas looks fine. Your only issue is your Joomla template is styling ul li elements aggressively, which is putting that dot in the top left. Right click and click Inspect Element in Chrome or Firefox to find where that CSS is coming from. You can also try install CB 2.x nightly build found below, which trys to fight such aggressive styling, but it's not a guarantee.
www.joomlapolis.com/downloads/doc_details/640-community-builder-nightly-build