The quetion about sound card output to Oscilloscope

Hi all ！I found a problem :I use labviewI created a digital square wave form to Export to  Oscilloscope，and remove The while loop（use finite samples），and Display images below，my sound card Default Sample Format：samples rate ：22050；16 bits  per samples；I took the  data points in The  vi ,（vi，Classification of data points in the graph below），