If you notice that your images look cropped or appear to be "overlapping" each other after you publish your tour, this is a result of not maintaining a 2:1 ratio with your images. Google recognizes images the best when they are sized 2:1. The main result of this is to do with cropping the bottom black stripe (nadir) from your image. Make sure that you never crop the bottoms or tops of your images.
Before uploading, make sure that your image dimensions are 2:1. For example, 6000x3000 or 9000x4500.
Tip: you may try adjusting your North by one or two degrees. This may fix the problem but is not always a guarantee.