I just installed the app on my spare iPhone (iPhone 6) with iOS 11.4 and the latest version of the app from the app store (4.8.18).
I mounted the phone on my windscreen holder with the phone turned sideway to the left (i.e. the Home button is on the right side on landscape mode). On the app screen, I see the road ahead of me in correct orientation.
I started my drive and started the app to start capturing. At the end of the drive, when I opened Uploads page I see that all the images are upside down (i.e. orientated 180 degrees).
I don’t have the problem when I’m using the app on my iPhone X (with same version of app and iOS) with the phone placed in same landscape orientation.