da – I didn’t mean that you were trying to scare anyone, sorry. Rather, I meant that you or anyone else who has been warned of lenses rolling behind the eye should not be scared by it.
And I did answer your question in my post – lenses can get lodged deep in an upper lid. As to why, I don’t know, but I would say that if your lenses get dislodged frequently you should probably have them refitted.