Not lock on target tatgeting me

[Canadane]

This is a bit embarrassing since I've played this game for years, but in PvP, apparently when someone is targeting me, and I don't have a target, I automatically target them and lock onto them.

This is annoying af to say the least when you try to escape. And never figured out how to turn this off. Is it even possible?

Hope I post in correct forum xP

I've never experienced this and I don't believe such an option exists for this.
I don't mean to sound accusatory, but uh... what else are you running with FFXIV?