I’ve got lots of buttons (choices) in my modal, and all are needed. How do I reorganize it better?

I'm making an interface that is part of a garment return merchandise system (customer didn't like the product and sends it back). Part of this interface allows customers to choose one or more reasons for their dissatisfaction with a garment.

I've got lots of structured options, and all of them are important to the product managers - they want to know what went wrong. Here's a mockup:

Lots of options, and quite hard to understand at a glance! I could visually separate the buttons by putting backgrounds/borders/grouping, and change some icons, but I think that it's still a lot of cognitive work.

Is there any way I can make this a little easier on the customers who fill out this form?