Pat yourself on the back. You were right! Kylo Ren’s scar in The Force Awakens does not match the scar in The Last Jedi. Writer-director Rian Johnson has just admitted it, and explained why he broke all of Star Wars’ renown verisimilitude for this small but ultimately fatal change.
Source: io9 – Rian Johnson Changed Kylo Ren’s Scar in Last Jedi Because He Thought It Looked Goofy