I shall give you the normal message:
Hello! I recommend you create a support ticket
here. Hopefully something can be done about this!
Note from me: Honestly this sucks, grinding a whole season and see yourself get bumped down an f top position just because of this. I'm not sure if this player was cheating or if it was actually a glitch. But hopefully something can be done about this and maybe your faction will get the reward for f top two. best of luck <3