Anyone else seeing this... and anyone got a fix?

I keyword my photos with photoshop and Bridge before uploading. What I'm seeing is that some photos once they are on the agence site are missing some or all of the keywords and I have to go back to my local copy and paste them across.

This is not down to a particular agency as one photo will show the problem on all of them.

From what I can tell, if I add specific keywords with photoshop and save as jpg, then go to Bridge and add more generic keywords from the batabase (like Blue, Large etc). All looks good on the file when views with Photoshop, Bridge or even windows explorer, but when it gets to the agencies only the first few added by photoshop are seen. Worst still, if I change the keywords (or discription) for example due to wrong identification, by the time it gets to the agencies it's reverted to to the previous discription.

It seems the the info embeded in the file is somehow layered. I see the latest version, the agencies see the first version even if I've since deleted it.

Is there any way of flattening the info in the file so there is only one version?

Thanks