Chart 'Update Link' - Missing

Hi

I have a Word document that contains charts linked to an Excel sheet. I created the links by doing Paste Special > Paste Link.
Now when i go into the Word document the charts look like normal charts and the 'Update Link' option is not available. I re-pasted the charts as a link, saved the file and when i go back in the charts show no option to update link!

I use this method on a lot of reports i do and this is the first time i have know this to happen...any ideas??

Thanks