Left pupill going sideways from time to time

Hi

I took Baker puppet from samurai as a template and try to make my own puppet. For some reason the left pupill moves independently. I checked and I have exactly the same behaviors. So I don't get why this left pupill goes right and left alone.

I saw "Basic Eye Rigging (Adobe Character Animator Tutorial) from Samurai but I cant' figure out what going on.

Any idea?

Thanks
Best
S