The first image is scaled 25%, *relative to the width of it's container*. Thus, while in preview, the image appears smaller than the normal view, because the preview pane is not as wide as the normal view. In both snaps, the first image does look to be about 25% of the width, so I think it's working correctly.
-e
Eric Shulman
TiddlyTools / ELS Design Studios
InsideTiddlyWiki: The Missing Manuals