How to reproduce

• Create a folder with sub folders and files
• Sort by name : the folders appear in first place (why not) and sorted in alpha order then the files are sort by alpha order => OK
• Clic again on Name header column : the folders appear in first place in reverse alpha order then the files are sort by reverse alpha order => OK
• Clic again on Name header column : I have a strange result (see screenshot), one the folder appear at top of the list, the other at bottom of the list => KO