You are not alone in experiencing this bug. Here’s a link to my post in case you’d like to read more about this issue: Comprehensive Thread Of All Top 500/Competitive Bugs. I put your thread under: Not Appearing On Leaderboards (Season 4). Please help in spreading the word about this megathread and other related threads regarding these issues.
I had a recent discussion on my megathread where two players were able to find a solution to this same issue. I will leave the link here: Comprehensive Thread Of All Top 500/Competitive Bugs - #300 by Azdyph-1127. I hope this helps.