'Vets' will probably know where this is leading to as most of us have experienced it at some point (it's not my first time!)
Yesterday a new contributor posed a well-formed question (about a steady-state heat conduction problem). Some members and myself made some decent comments. We got no reply.
I then decided to answer the question in full. I didn't get an immediate acknowledgement of my effort.
And much to my annoyance the contributor had deleted his question when I checked in this morning.
This is both frustrating and ineffective: the question (and answer) had received no down-votes or votes to close and could have been informative for other members or searchers.
So it appears that some new contributors simply lose interest in their own question and delete it, together with someone else's work! 'Newbies' are of course not quite as invested in P.SE as regular contributors.
I wonder if some moderator oversight would be useful here?