LuxXeon posted at 4:51PM Tue, 24 March 2020 - #4384418

There's a specific technique to unwrapping a box which would prevent UV islands getting rotated or reversed like that. Not sure which version of Blender you're using there, but here's a video from back in 2012 that shows the proper way to mark seams and unwrap a cube, or any box-shaped object. It's easier to manage the UVs in one island rather than having 6 separate island panels.

I'm still using 2.79 unfortunately, but hope to upgrade soon.