Did you get your seeds in the mail when it was very cold? I no longer order seeds between Dec. 1 and March 1, as by my own experiment I found that if pepper seeds freeze , the germination rate goes down considerably and even if they germinate they may be slightly damaged. Several years ago I took 20 of my saved Ghost pepper seeds and split them into two groups of 10. I left 10 as they were and put the other 10 in the freezer for 4 days. I got 8 of the non frozen to germinate but only 3 of the frozen ones germinated. Not a scientific test, but good enough for me. The trailers that transport mail are not heated.