I actually have this issue too. I also figured it had something to do with Leawo. My hunch is it has something to do with differences between burned media and commercial discs. That opinion, however, isn’t based on much actual knowledge or evidence.
For me, though, I’m calling it good. The discs seem to work fine in blu-ray players, and the mounted ISO works fine on computers.
But if anyone has any ideas on what might be causing the ability to play the discs but not navigate around in them on computers.