The sort order marker in details mode file listing is upside down.
When files are sorted in ascending order, the marker in the column header is pointing down (v) and vice versa.
This applies when sorting by any column (except type which seems to sort by something other than the text shown on the column).
Steps to Reproduce:
1. View a folder with some files in details view mode.
2. Click file name column so that the sort order marker is pointy end up (^) signifying ascending order.
The files are sorted in descending order i.e., reverse alphabetical order.
The files should be sorter in ascending oder i.e., alphabetical order.
Natural sorting may be on of off, doesn't matter.
See discussion at bug 297807.
OK, so let's close this because this is neither a Dolphin-specific issue nor an actual bug. See the bug that Christoph linked to for instructions how to change the behavior.