Missing socketed skill

https://prnt.sc/awr7P02PlpDW

I haven’t been able to use this skill since level 30. None of the websites I’ve searched online have helped or provided a solution. I’m wondering if this is an in-game bug or a mistake I made while playing. I’d appreciate it if you could help me with this, since I don’t want to keep playing without skills.

Skill name: Called Shots
Issue: Missing socketed skill