The left/right side bearing should impact its position, so check that you have the newer font version (and not an older version store in some memory cache).
I believe this is an issue with Watch Face Studios after investigating the issue. In Watch Face Studio, in the watch view of the program, the 4 is center. Only when I run on device, does the 4 look of center. So it’s something Watch Face Studio is doing, when it runs on my device, or creates the application file.
So there’s nothing anyone on Fontself can do to help. Thanks tho.