weird escaping in post body

I have a post with pre section and WP seems to be doing a weird unneeded escaping of single- and double- quotes inside the pre tag. As a result, final output looks wrong. I’m completely puzzled – can anyone help?!

I do not use plugins like Textile or Markdown and I turned off all formatting options. I’m using wordpress 1.5.2.

The post is question is here: https://maxischenko.in.ua/blog/entries/86/auto-detect-file-unicode-encoding-using-bom/

I found this (related) support topic but it didn’t help a lot.