***Edited by Moderator Marissa to update Pega Academy to Product***
You need to make sure that your controls uniquely match in order to work with them. You might need to disable UseElementID if that is not a unique match. If you truly cannot match a control uniquely, then you can enable UseKeys to allow Runtime to attach to multiple controls at a time. This will require you to iterate through the clones (GetClones method of the control) and select the correct one at Runtime in an automation.