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Is this an issue you're only experiencing in a word processing program, such as Word or Pages, or is it system-wide?
If it's system-wide, you may be able to fix it by going to System Preferences > Keyboard & Mouse > Keyboard Shortcuts and then clicking Restore Defaults. I don't see anything in my system settings that looks like it would be likely to cause this, though, so I don't think this is that likely to fix it.
If this is only happening in your word processor, let us know what application you're using and we can probably help you track it down.
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