I just attempted to merge duplicated on a board and they are all gone in from both places now. Please advise.
Hi @salhudsy 
Sorry to hear you’re having these issues.
Were you trying to import items into a board via our import tool, or are you perhaps using an app from the marketplace?
If this was whilst importing items, we’d love to have our support team take a closer look into the issue.
Could you please reach out to them via support@monday.com?
If you’re using a third party app from our marketplace (i.e. one that was not developed by monday), it would be best to reach out to the developers of the app directly.
You can find the contact details for each of the developers from the marketplace app page.
You can visit the marketplace here: https://monday.com/marketplace
The search bar at the top will allow you to easily search for the specific app by name.
From here you’ll be able to find a contact email for the developers.
I hope this is helpful!
I was only using the merge duplicates function inside of Monday.com.
Got it! In which case, could you please reach out to our support team?
They’ll be able to look into this further with you and run through some troubleshooting steps 
Apologies for the additional steps!
All they did was suggest I go Undelete each one individually.
My real issue is why is this happening in the first place?
Hello @salhudsy,
You can check out the Duplicates and Uniques app to merge your items
Hey @salhudsy,
We agree, this should not have happened in the first place, and we apologize that you have not found or been given a solution. You’re welcome to reach back out to support, and mention that Bianca from community has directed you - this way we can ensure this is properly investigated!
Warmly,
Bianca