When I try to Stow a favor orb, it will drop it instead.
I don't know of any other item that does this, it is frustrating when I forget about this 'feature'.

Please fix this.

another thing that would be a nice add, if you break one of your favor orbs some of your drained xp returns.

>>Suggestion: Stop getting more than 2 favor orbs.<<

That was my first thought of what was being done too.

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Inside each of us, there is the seed of both good and evil. It's a constant struggle as to which one will win. And one cannot exist without the other. Eric Burdon
Read more at: https://www.brainyquote.com/topics/evil

>I only have 1 favor orb and that happened, but now I know that it happens when you have two as well.

I've only ever seen it when someone has gotten three. I'd bet that the 1 that you had was one of three that you got at one time, and you turned in the other two.