While playing today I noticed I was having issues with the game locking me onto enemies I never clicked the keybind to lock-on for.
After short testing I found that the mouse wheel scroll acts like the keybind for Locking onto a target. Due to my healing being Middle Mouse button I sometimes scroll on accident since my mouse wheel is easy to scroll.
Would love an option to disable mouse wheel scroll for targeting and only use it after the keybind to target an enemy is used.