I am also aware that one of the " Gotchas! " of skydiving aviation is the informal non progressive loading by parachutists who may not be fully aware of the C of G (handling & control) implications. This flight was for two tandem groups who probably wanted to jump as close to each other as possible (photos & video) through a rear cargo exit. A rear C of G risk factor!
Tandem pairs do not jump as close to each other as possible, and they are not getting ready to jump out at 200ft