Possible Bug with Tham Kench devour

So I just played a game as Tahm Kench and I think i found a small bug. I apologize for not having any concrete proof or example but I suck at computer stuff. All game i was able to devour my teamates except my caitlin. I was unable to target caitlin with devour the entire game I would just click around her and walk to her instead. I could devour enemies, minions, and the other members of my team. Idk if that was a bug or if Im just bad. Has anyone else seen this before?