Thanks all for your responses.

My RP is for a year, I have had it for less than six months, and it will be valid for more than six months after my travel.

I am not quite sure which of the above statements are actually relevant because the published rules aren't clear.

I do take the advice that it may be wiser to travel another airline, as the confusion seems to be coming from FlyDubai.

I shall inquire at Dubai Immigration when I get there as to what the actual rules are.