I've no idea why this is happening, but it might be a glitch with that page.
You could try copying all of the page's content, then opening a new one and pasting the copied content there.
If you do that, can you save the newest page instead? If so, you can delete the other one.
Which browser are you using? IE? Can you try with other browsers - Firefox, Chrome?
Also, do you see a "Done with errors" message with an exclamation mark on the lower left hand corner of the page?
This is just a guess at this point - but it could be that there are script errors on the page, if IE is blocking Java and/or scripts - please see this troubleshooting link from Microsoft - http://support.microsoft.com/kb/308260
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