Is this a bug or something else?

[Darkrenown]

Since deleting my king from the list of leaders available to Sicily didn't work, I actually loaded up as them and disbanded all of their armies, and continued doing so every time they started building another.

There's an example of what to remove here, although if that's what you removed and they could still steal your leader then I have no further suggestions

 

[Cenobite30]

There's an example of what to remove here, although if that's what you removed and they could still steal your leader then I have no further suggestions

Thank you again. I also tried your unofficial fixes. Woot!

 

[Cenobite30]

There's an example of what to remove here, although if that's what you removed and they could still steal your leader then I have no further suggestions

It appears my file doesn't have that under the junior partner's info. It's only under mine. I tried deleting the leader ID from near the end of Sicily's info (right before the end, past missions and dispositions and such), but it didn't change anything. Since they are pretty useless anyway, I'll just keep deleting their armies.

 

[Darkrenown]

I know I said I had no further suggestions, but actually you could probably cheat them in some cash and hire a bunch of leaders for them. Maybe then they'd use those rather than stealing your king.