No, they are Links widgets.
a) You added the Links widget to the left sidebar but didn't add anything to the right sidebar. When you don't add any widgets yourself, the theme displays a default set of sidebar items. The default set in the right sidebar includes Links, hence the duplication.
b) Some themes (and some browser versions) cannot downsize images to the width of the sidebar, especially if the images are hosted elsewhere. You should copy the images to your computer, use an image editing application or an online tool to downsize the images,* then upload each image to your blog via Media > Add New, click Edit, copy the File URL from the Save module, use that URL in an Image widget to create the link (or edit the links in Links > All Links and replace the current image URLs).
* Maximum width for Garland: left sidebar 198px, right sidebar 188px.