LR showing some subfolders, not others, even though it created them all.

When I finish processing a folder of pics in LR, I always export to a subfolder. At present a lot of my newly created folders are showing, and a lot are not. I can open another program and see them, they're there, and I created them in LR. If the file is xyz, the export subfolder is xyz LR. It came from LR. But LR isn't showing lots of them.

I've had the experience, not just in LR, of programs not redrawing file structure while open, but even closing and opening does not make LR show these subfolders.

How can this happen, and how can I make LR show all the folders it has created?

That's my question, but in case there's a connection, at the risk of mixing questions, some of the folders (not subfolders) have a lot of missing pics. Of course those can't be exported, and won't be in the subfolder, if it even shows up. But what I'm working with now is scanned slides imported in batches all at one time from folders previously copied to my hard disc from storage media. Whole folders copied to disc, imported, processed, exported. I cannot imagine how all the photos were not treated exactly the same way. Yet Sometimes the export doesn't show up in Library and sometimes some of the pics go missing. It seems I'm going to have to go back to the storage media and find them (ugh- lots of discs) and re-import them. It's mysterious.

(About my subfolder process, it's akward and wastes space, I know. But really, I know no other way to function in LR. I know (now!) that if the file is on the hard disc I can just "add," it to LR but I always need to have access to the processed pic outside of LR - just don't/can't "do" LR to that extent, too difficult, and for browsing (finding), printing, viewing, I can't get comfortable in LR, though I've spent a lot of time there over the years.)