Image Comments Are Not Sized Properly Answered

I've been having trouble with image comments not showing up the right size in my instructable, How to Build a Spark Gap Tesla Coil (link). In step 2, this is especially visible as some of the image comment boxes appear to be larger than the images they are posted on! The comments are supposed to be the size of the image, not smaller or larger. I've tried resizing them to the correct dimensions, but it doesn't work. Is it just my browser, or is something else going on? What can I do to fix this?

Thanks!

Xellers