EDIT: I found why this is happening. There is a pattern to it.
When the Player Name is shorter than the Player Title, the Signature extends to the length of the Player Title.
https://overwatch.blizzard.com/en-us/news/patch-notes/live/2025/02#:~:text=Fixed%20a%20bug%20where%20the%20Drives%20Signature%20VFX%20would%20sometimes%20extend%20off%20the%20nametag.
Notice the enemy Mauga.
https://i.postimg.cc/vHpwG3Lt/Screen-Shot-25-02-19-04-45-33-000.jpg