You just opened a project in ArcGIS Pro and a little message popped up, warning you that a datum transformation cannot be found and that the data may draw with an offset.
![1.png 1.png](https://community.esri.com/t5/image/serverpage/image-id/19365i1E14D3B995DA0819/image-size/medium?v=v2&px=400)
If that sounds scary or confusing, read this article on ArcGIS Blog to find out why you are seeing it and what you can do: https://www.esri.com/arcgis-blog/products/arcgis-pro/mapping/transformation-warning/