My own submitted flash fictions have varied quite widely in their nature. Some have been quite dark - murder, other death, jealousy, obsession, weirdness, threat and so on, with several of these appearing in my collection Bottles and Pots. Others have veered towards the lighter and hopefully humorous. Guess which types have won or been placed more times?
As I enjoy writing and entering flash fiction, I do read a great number of others' entries, especially those longlisted, shortlisted or placed. What troubles me is that these - and this often applies to your actual short story winners - tend to be disturbing, stream of consciousness, surreal or generally depressing. Quite prepared to be contradicted; this is just my impression.
Wouldn't it be pleasing if, sometimes, lighter work and humour could be considered worthy? Guessing most of us study what's been winning before we submit, as is wise, but I'm imagining a tranche of flash fiction competitions that state the judges are looking towards fun/humorous skilful writing that manages to tell a story, show a snapshot, make a point, deliver a twist - or all of these.
This a bee in bonnet matter!