Under the Leaderboard, Rules tab it states that the emulator must be Stella (which in my run is shown top left of the window). Under the forum sticky it also states that settings used must be shown ( which is what I failed to do) and it is this that is not included under the Rules tab. Unless there is another reason that my run was rejected.

Just an FYI to any new players, The Rules listed under the leader board are not the same as the rules listed in the stickied forum post. Don't get caught out like I did.