On the prepress proof of the box, the image seems larger than the template. Is this normal?

If you notice this discrepancy, it is because we will have slightly enlarged the size of the box when making preparations in InDesign. This is a standard procedure which allows us to predict the tension of the vinyl when we produce the box. Without this, the edges stretch the material by a few millimetres and any discrepancy (or, in the case of your box, faces separated from each other for design reasons) can become much more visible.

Link to this answer: https://azaogames.com/en/faq/on-the-prepress-proof-of-the-box-the-image-seems-larger-than-the-template-is-this-normal/