...normally when you paste something the information that is eventually pasted comes from the operating systems clipboard, the systems clipboard holds only the last data you copied...
...if your sure you haven't copied the data your pasting then something strange is happening...
...you can view the clipboard in windows by performing the following and clearing the data of recently copied data:
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Windows Vista or Windows 7 - refer to this link about clearing the clipboard and making a shortcut.
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Windows XP
Begin by first clicking on the Start Button.
Then click on Run Icon, which will open up the Run Menu for you.
Locate the white area of the screen next to the word Open: in the Run Menu.
Now type in the abbreviated word Clipbrd and click on the OK button to launch the Program.
Notice how the Clipboard contains a record of your recent copy and paste inputs.
To empty your Clipboard, click on the word Edit located within your top tool bar area.
Then click on the word Delete from the pull down menu that appears.
Windows will ask you if you want to Clear the contents of the Clipboard.
Click on the Yes button to allow Windows to clear the Clipboard.
Notice how your former imputed information is now cleared from the Clipboard.
Then close the Clipbook Viewer Window to return to your Windows session.
andrew