upload box wacky shows wacky ordering of files
firefox upload box shows file ordered by "modified". these files are in a different order than those displayed by Nemo. The files are all created at approximately the same moment. Nemo orders them correctly file1, file 2, file 3 etc.
Sounds that you order the list by Modified date. You should be able to click the Name columns header to sort the l.list by this column.