It sounds like these did not import correctly at all. I don't know if that's a bug with the current Mac builds as I only have access to a Windows machine right now.
The [Filename] tag should point to the iso location, and each track should end with: \albumname.iso;1 where ;1 is the [Track #]
SACD iso files are a huge pain to deal with if something goes wrong, as you can't just edit the fields easily to fix things.
Assuming that the issue here is the filename, what you need to do is:
1. Select all tracks in the album and open up the Rename, Move, & Copy Files Tool. (right-click and it's in the Library Tools section)
2. Put the RMC Tool into Update mode at the top-left, not rename or copy mode.
3. Only have the Filename and Find & Replace tools enabled.
For Filename, use:
[Album].iso;PadNumber([Track #,0], 0)
If [Album] does not match the name on disk, change it to match the iso filename. (or rename the iso)
For Find & Replace, you want:
Find what: .sacd
Replace With: BLANK (leave it empty)
That should hopefully fix the SACD playback.
I've attached an image to show you what this should look like from the Windows version.
You can see that it fixes the album by adding the track # suffix. It will be slightly different on a Mac.
Discs with stereo and multichannel tracks usually list the multichannel tracks after the stereo ones.
So a 7-track album may list 14 tracks, and track 8 is really track 1 again, but the multichannel version.
I usually split these up by changing the album tags from "Album Name" to "Album Name (multichannel)"
There is also a "Fill track numbers from list order" library tool you can use to quickly make these 1-7 instead of 8-14. Do this after fixing the files as described above.