Bust Image location (how to make it stable)

Hi everyone!

I'm using in my novel both bust and full height images. I made bust location in System section, as it described in tutorial. It works fine, when I add character to the scene. But when I change character location to another and then switch it back to Bust Image, the formula works wrong and sets different location for speaker image. Is there a way to fix it?

Edit: I get everything okay, if I make Exit Scene and Join Scene again. But that's not good decision.

 

Sorry for long answer. Encountersd some unpleasant life issues... I would love to make a video, but as soosn as I prepared to record everything, the formula began to work properly. Have no idea why, since I didn't change anythig. So now everything works fine. Nevertheless I thank you for your attention.