To reproduce the duplicate WAP issue, the fastest way is to basically tap the checkboxes quickly at random, not waiting for any of the animations to finish.
However, I've also had it happen quite reliably when I select an encrypted network, wait, then hit cancel. Afterward, the encrypted network disappears from the list and is replaced by a dupe of something else.
To reproduce the duplicate WAP issue, the fastest way is to basically tap the checkboxes quickly at random, not waiting for any of the animations to finish.
However, I've also had it happen quite reliably when I select an encrypted network, wait, then hit cancel. Afterward, the encrypted network disappears from the list and is replaced by a dupe of something else.