If you are working on a form in LiveCycle Designer which has not just form variables but also object collections and/or script objects all those will be listed on the Hierarchy tab under Variables.
Issue: If you delete a form variable from the Form Properties dialog (File > Form Properties > Variables) the wrong one will get deleted if the variables are not sorted.
To resolve this issue read this blog post.
Issue: If you delete a form variable from the Form Properties dialog (File > Form Properties > Variables) the wrong one will get deleted if the variables are not sorted.
To resolve this issue read this blog post.