random characters appearing when site is rendered

On a couple sites I've made random ASCII characters have been appearing in the middle of the document. It's always been on test sites and has never been a problem until my most recent project for a client that it just appeared on. They aren't displayed in the development environment I use (aptana 3), but then appear both on screen and in the source code when viewed in a browser.
I've looked around and it looks like others have had the issue but I haven't been able to find any real solution. I tried messing with the text-encoding but nothing changed. Has anyone been able to solve this issue?
 
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