Mac with Golden Gate 27.0.1 - on import with add, it is changing the hierarchy inside LrC to outside my normal hierarchy

Perhaps try for the “2026” folder which contains these three separated image subfolders, choosing “Update Folder Location” in its context menu. Then in the file system browser, re-choose the 2026 that sits within “All Photos Digital”. 

You can also troubleshoot this using “Show Parent Folder”. The aim being to expose the point of difference. Then you can get the Catalog to re-read file paths (as above) onto all the affected images. for example: you could use Show Parent to expose an “All Photos Digital” entry that sits above the 2026 for these three folders. And either that one, or the other one, could then be re-browsed as needed. 

TLDR;

If there had been a change in the meanwhile from say “All Digital Photos” to “All Photos Digital” - in the file system - all prior imported stuff would have shown as offline very obviously. But if a change is of capitalisation only - for example, this often happens in the username part of the overall filepath - the OS considers that only cosmetic, but the Catalog considers that substantive.

So when the Catalog asks the file system “is filepath such-and-such currently present and available” - the file system will disregard capitalisation in deciding whether to respond yes or no. It does not care.

But the Catalog does care: whenever it has two filepaths remembered which are differently capitalised anywhere (and this does not need to be in a part of the overall filepath that’s visible in the Catalog) it considers those to be two discrete locations.

What you see in the Folders panel is a summary view taken from a whole lot of remembered filepaths per image - information coming only from the Catalog itself. It is not a window onto the actual file system.

This is how the Catalog can still display the structure of folders that it remembers even while the storage drive concerned may be physically disconnected, or otherwise changed so that the remembered arrangement / the current actual arrangement now DISAGREE.

What does the hierarchy look like in the MacOS Finder? If it is the same as in Lightroom, then you can move the folder(s) like ​@AxelMatt says. If it looks different (no folder outside the hierarchy), then you are the victim if the ‘capitalization error’. Here’s how to fix it: https://www.lightroomqueen.com/capitalization-catalog-error/

Move the apporiate subfolders via drag-and-drop inside in Lightroom (!!!!) to the folder “All Photos Digital\2026”

Don’t do that outside of Lightroom, for ex. in Finder.