batch import of MP3 files

Hi when I import several mp3 files into audacity eg file numbers 1 to 10 when I replay them, always one or two files are in the wrong place, example

i get a file sequence 1,2, 3, 6, 4,5,8,7 ,9 ,10 but imported they are 1,2,3,4,5,6,7,8,9,10. To stop this i seem to be limited to importing 3 files at a time regards colin