Hi Stephanie,
When columns are reordered on the server, the Swap method is always used: https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/columns/reordering.
To get the actual index on the server, you must subtract 2 because of the structure columns in the grid as noted in the article above. Nevertheless, I will improve its structure to make this information clearly visible.
Here is a simple example:
Regards,
Marin Bratanov
Progress Telerik