No, I havent tried re-adding the files; I'll try and see if that fixes the problem. As for the other files marked as .sys and .exe, yes they are .mp3 files, those are just the track names. Here is another example of an album of the same artist with similar track names that display correctly, and with both albums as viewed from within My Files.
I have a similar problem on my S9 although my files read all the metadata correctly besides the year - all my songs just have "Unknown" instead of displaying the year.
What I did to fix my album covers and some files before was this:
1) Go to the My files app and tap the 3 dots in the top right corner, go to settings and then "Show Hidden System Files"
2) Go to your internal storage and fiind a folder called "albumthumbs" delete the contents of this folder
3) Got to settings then Apps or Application manager, enable / show "System Apps" and then scroll and find "media storage" Clear the data
4) Clear the Cache of your music player
5) Restart Phone
What this does is forces your phone to Re-scan all of your media files [Pictures Videos Music]. This may take up to an hour depending on how many media files you have on your decive, BEWARE this does mess with the order your photos appear in some apps [For example if you were to try and upload a photo to instagram your photos will not be in the order they were before you did the re-scan]. But this will not delete any data, you could backup files to be safe but in my erperience nothing was deleted and I have over 2K songs, photos and videos