Does your caddy appear to be lop sided on the buggy?

It’s probably hanging on an angle because the straps are not correctly attached to the buggy handle/ frame. One strap is deliberately longer than the other so that a parent can carry the caddy, off buggy. 

caddy straps are not the same length - one side needs to be looped twice around the handle. This excerpt from your full user guide will help

Loop the long strap twice (2x) around the buggy handle and then clip both sides. Its easy!