That's a quirk of the font, I'm afraid. Capital and lower case look the same with this font
I also updated the CSS : I finally added the checkboxes. In a really good way. Instead of redesigning, I keep the 10x10 PNGs and upscale them with image-rendering: pixelated.
Is there a certain page that leads you to a broken 404 page? I know it used to have issues when pages are in a folder other than the main one. I'll have a look around to see if I can fix it