Can't delete instagram comments?

I will delete the comment, refresh the page and it will appear again. Any ideas? I've logged on on iphone and tried it, then the ipod and even on the computer.

1.Browse for the photo you have commented on. You can only delete your own comments on other pictures, or other's comments on your own pictures.
2.Use your finger to swipe the comment to the left. A red trash can icon will appear on the right side of the comment. Tap the trash can icon to start deleting a comment.
3. Decide if you want to report the comment. If the comment was spam or offensive, you can report the comment as well as delete it. This is useful if creepy people keep commenting on your pictures. Tap "Delete & Report Abuse" to report the comment. If you'd rather just delete it, tap "Delete" instead. You will only be given the "Delete" option when deleting your own comments.

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