which instruments has this happened with ?
A couple of people have mentioned this issue with Summer Piano. It looks like an issue with the _MACOSX folder.
Make sure you are using the latest version of the unzipping tools that you use.
WinRAR is at v6.00
WinZip is at v25.0.14273
7-zip is at v19.00 (or 20.02 alpha)
Have you tried repairing the zip file(s) ?
This can be tried with winrar or 7zip (probably winzip and other software too).
(Testing how many edits I can get in)
5 6 7 8