How did a customer manage to remove my static layers

Hi

I have two images/layers added in Product Builder. They both have any edit options disabled ( scalbale/movable/removable/rotatable - really, all of them )

And yet, the other day I got an order where only the printing area was present, both static images removed.

How did they manage to do it ? I tried to challenge the UI myself but to no prevail. Not even CSS ( even though I guess on-page CSS changes would not be saved in the order ).

I am using 4.0.6 

Any ideas ?