In addition to its retail marketplace, Amazon hosts a 3rd party marketplace that allows sellers to list product for buyers to purchase even when they are not affiliated with the brand. If your brand has not been established on the platform yet, a seller may get to Amazon first and create a listing (ASIN) they control, that has less than optimal attributes, images, etc. for the product.
If you are the rightful Brand Owner, your best option here is to join Amazon’s Brand Registry which establishes you as the intellectual property owner of the brand. The brand must have a trademark registered to participate. Once enrolled in the program, you will have more control of how your products are represented and even who can sell them on Amazon.