Item Repeated Itself In Timeline View

Hi All,

As you can see in the image I had posted, why does it seem that the items/tasks are repeating itself? Items are not repeating in the Main Table though. Please help. Thanks.

I have the same issue when connecting to monday.com with an API, I get duplicate items depending on how much views I have in a board.

I had this issue and realized items were duplicating due to the Timeline settings for showing columns:
Clicked on Settings:


and then unchecked “Completion Date”. Both it and “Task Duration” were showing in the Timeline. When I removed the one, the duplicates were removed.
image