Have played like 15 games now, it stays the same after wins for like 3 games in a row, then I lose 1 and I go up 40 ranks, lose another stay the same rank, then win and it accurately updates for a few games, then it stops updating again for a few games.
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.