Welcome to the forums stefanus36021!
Thanks for your post, nothing wrong with that game, it was actually tight and close. Maybe your team just had a bad game?
As for the fixing of the MMR, ValorantForums.com isn't the official forums so we cannot fix or request a review to fix this. But I do not think the MMR is broken at all.
Hope I helped you and I look forward to more posts from you!