Hi
I got this issue and managed to fix it. So my problem was, I downloaded a bunch of games and one of them was corrupted.
I tried deleting but it end up not displaying any titles at all apart from TM++
Here's what I did.
I take out the micro sd card and put in my computer then right click on the card and select "properties", go to "tools" then repair sd card. (You can use windows powershell with "chkdsk [sd card drive letter] /f " to repair too)
When this is finished, you need to go to titles, so on your sd card go into your "Nintendo 3DS folder" until you see the folders called "titles" and delete the broken file (the corrupted title folder has been repaired into a file) and delete that file.
Now it should work, take out your sd card and plug it back in the 3DS.
May God Bless everyone in Jesus name