DSD gets converted to PCM when app is closed and start again

[MusicEar]

Version 5.7.5 has strange bug when app was playing DSD track in native form to my USB DAC, later I closed the app then start again, continue where I stopped i.e, press the playback button to continue playing previous DSD tracks, DSD is converted PCM. However, if I selected a new DSD track, it played back unconverted. Irregardless whether I set to DoP or native. I'm using Fiio Q5s DAC.