Then there are two options, either your Q&A question is too easy, or you're being hit by human spammers. Looking at your question of your board, I'm thinking it's the former.
I'd recommend taking a question that is really specific to your board. The question you have is likely to be solved by bots since it's a very general thing. Something for your board would for example be: "What is the icon that this board is using for the "Dating and Relationship Advice" forum on the index page?". The answer would be: "heart" or "a heart".
Also, try changing up your question every few months, to keep it original.