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.
Here’s two threads about your missing Top 500 leaderboard placement issue if you’d like to read more about other potential solutions: