Did anyone experience this?

As a backup test, I've exported initial default ~1410 jazz songs list
as a .html file. Then edited one song (just replaced F-7 with F in one measure) and hit SAVE.
Save button got grayed out, indicating that actual save of changes took place. However, it didn't!
What got saved is unedited original file.

The way I checked, I backed up the database to a file with different name right after editing
and saving it. Cleared existing database and loaded just saved file back, hoping to see my changes.
Nope, it loaded original content from edited/saved file as if all edits got lost.

To make sure, I compared bit-wise both original and edited/saved .html files on a PC with programmer's
utility. Files were identical.

Any clues why "Save" function does not really saves any changes or edits?
Until this works, you don't really have a backup! Backup/restore functions do work, but your data
stay unchanged, e.g. your edits are lost, making backing up completely pointless.