I cannot do anything for sure to cause this problem to occur. I will know upon my first attempt of firing him if it is acting up or not, he will either fire from under me, or he won't. Once it starts it won't go away until I just go about playing and doing something else for a while. I can come back after say ten or twenty minutes and try it again and he'll fire properly. It's completely sporadic on whether his coordinates line up when he's called for and no amount of soft/hard resets or reloads or zone changing will fix if the coordinates catch or not. I was able to get through the keep at the beginning of my game without an issue (else I wouldn't be starting chapter 5 right now), but then when I got to the Boggly Tree for Chapter 2 he wouldn't fetch a badge on a distant ledge due to this error. He would fire from the column behind me, which I thought was weird, but I shrugged it off thinking "I'll just come back when I have the yoshi" (that partner can hover over gaps). I mean in all reality I can shrug this sidequest off too until I get another partner, but I wonder how many people might have had this issue that didn't report it, and who might have had it back in Chapter 1 when it's absolutely required to function to continue the game.