I have some files with random names but all beginning with a number. I noticed that these particular files would not be in the correct alphabetical order (1). If I go to the View mode, change the sorting order, go back, and change it back to alphabetical, it will be correctly sorted (pic 2). However if I then close Solid Explorer and restart it, the number files will go back to their improper order (pic 1). I do not know if it is related to the files having an image filetype extension, but I also uploaded some empty files with the names that were causing this issue. I hope this helps you reproduce the issue and fix it.