You can choose whether Capture One should automatically select all the adjustments that you have made on the image when you click on Copy.
The Autoselect feature is controlled by clicking on the action icon and selecting Autoselect -> Adjusted or Autoselect -> Adjusted except Composition. The latter option ensures that adjustments like Crop, Rotation and Keystone settings are not copied from one image to others as these will typically need to be set on an image per image basis. You can also turn the Autoselect feature off by selecting None.
Also, the action icon is not available if you access the adjustments clipboard via Adjustments > Copy and Apply Adjustments.