Single post title alignment issues with WP 2.6 and captions

I just upgraded to WP 2.6 and have implemented the recommended fixes / CSS additions for the new image captioning. I love the captioning but the coding for the left / center / right aligning fix in the CSS is misaligning the post titles and navigation when viewing single posts (it looks fine when viewing the index). An example of how it looks messed up is here:

http://www.thorntonweather.com/temp/cap2.jpg

Versus how it used to look:

http://www.thorntonweather.com/temp/cap1.jpg

The main blog pages can be viewed here:

http://www.thorntonweather.com/blog

And lastly, the code I added that seems to cause the problem:

/* Added for image alignment issue */

img.centered {
	display: block;
	margin-left: auto;
	margin-right: auto;
	}

img.alignright {
	padding: 4px;
	margin: 0 0 2px 7px;
	display: inline;
	}

img.alignleft {
	padding: 4px;
	margin: 0 7px 2px 0;
	display: inline;
	}

.alignright {
	float: right;
	}

.alignleft {
	float: left;
	}

I have seen this same issue with a couple other sites but haven’t found a fix. Any help would be greatly appreciated. Thank you!

Tony