Are there hidden quirks?

[Lews Therin Telamon]

Every now and then, I have a character steal loot but they don't have the Kleptomaniac quirk. Or any other quirk that would explain them jacking my stuff. Is there a hidden stat or something that determines when someone will randomly take stuff?

[Katty Nat]

Afflictions. Aggressive broken minds will steal things as recompense for their suffering.
Also, I've read Egomaniacs can steal, but I've never seen anything like with Klepto (so either I'm misinformed, I'm lucky, or they reduce the amount of loot you get after they do their auto-interact).
That's it.

Either way, any Klepto either goes back on the road or goes in a cell. No thieves in this house.

[Skinny Pete]

Diseases can also cause it, specifically Tapeworm, which causes heroes to interact with and steal from food curios.

[Dr. Jekyll]

Affliction "Selfish" also works like this.

[Yal]

A bunch of the "obsessed with <thing>" quirks can make heroes randomly interact with a curio without your input, but they won't STEAL the stuff, they'll just force an interaction that you might wanna avoid.

[CrackerjackTiming]

The Egomania quirk can also cause a character to steal stuff. I'm not aware of anything else besides Kleptomaniac, the Tapeworm disease, and the Selfish affliction which causes a hero to steal loot, instead of just interacting with the curio.

[Lews Therin Telamon]

Thanks for the info everyone, I'll take a closer look at these things next time it happens.