A mod should have different methods of contact attached to their profile (Twitch channel, discord, twitter, etc.). Try those. If that doesn't work, you're a bit out of luck unless they see this or someone brings it to their attention.
That said: a ) I remember reading from a previous post that game requests are automatically rejected if the submitter does not have a method of contact in their profile, which I note you do not. b ) A mod is usually in the right for their reasons for rejecting a game. If the reason seems weak, the game has probably been submitted and rejected before. c ) I'm not sure how a glitch could be grounds for rejecting a game unless I'm misinterpreting your statement.
@Lieutenant_Boo this is about a run submission, not a game submission.
@CanterburyEgg You're of course free to discourse with the mod in question (most games have Discord servers nowadays and they all have forums on this website, so even if there's no personal contact info for the mod -- which there should be -- try those). That's how categories and standards for them can sometimes evolve over time. That said, this doesn't sound like something a mod is likely to change their mind about. Either submit the run to a different category or redo the run without the glitch (if you wish it to be listed here).
I just want to note that we did resolve this issue and I clarified how it was a glitch. All is well now and looking forwards to seeing more runs from them.