It's more than 'weird'. It is even possible to delete a Plasmoid that you have added to the Desktop when using the LiveDVD, so something is completely wrong with your installation if you cannot remove a Plasmoid from the Desktop. Have you tried adding another Plasmoid to your Desktop (choose any other Plamoid, or even another instance of the Trashcan) and then tried to remove it? If you find you can't remove that, I'd be inclined to delete ~/.kde4/ and reboot (KDE will recreate a fresh ~/.kde4/ if you delete it).
EDIT: If you feel uncomfortable just deleting ~/.kde4 then make a backup first:
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$ cp -rp ~/.kde4 ~/.kde4bak
Then, after you reboot and recreate your Panel and populate it and your Desktop with instances of the Plasmoids (widgets) you like, you can delete the backup:
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$ rm -rf ~/.kde4bak