Hi,
You can turn on the "keep size" setting of the badge. That way it will display the same everywhere. Note that you might have to adapt the size of the badge image in that case as the size used will be the size of the original image.
Now, on the same listing, the badge should ideally have the same size regardless of the original image. We'll change that for the next version of HikaShop so that even with the "keep size" option turned off, the badge image is consistent.
Thank you for your feedback.