Well, I'm gonna go out on a limb here:
I'm not 100% sure how the sync cycle works on the Palm software, but if it's anything like other sync software then:
--> Make sure your 'preferences' or whatever dictate that your computer over-rides the handheld, and then delete all of your contacts on the handheld. Then, sync, and it will re-copy everything
just once back over to your treo.
WARNING: I MAKE THIS STATMENT ASSUMING THAT YOU HAVE ALL OF YOUR CONTACTS THAT YOU "WANT TO KEEP" ALREADY ON YOUR COMPUTER W/OUTLOOK. If not, then please do so first, as I don't want you to lose any information, b/c then you'd not like me.