Yes, it happens all the time. Even when some writers have the best of intentions, if you let a character into your heart, even if you didn’t create that character, it hurts to see them with someone else’s voice.
I know I should be grown up about it, but it’s difficult sometimes.
The reverse is when someone does a GREAT job with your characters, that’s a happy, happy day.
Also, I have messed up with other people’s characters sometimes and you just feel guilty FOREVER.