Wterrain2 opcode in Csound for Android

I was listening to the Canonical reference manual example of the wterrain2 opcode in Csound for Android. It sounds bizarre, the pitch keeps modulating in odd ways (audio rendering here:)

I’m not sure why the displayed player isn’t working correctly but here it is : “Dropbox - wterrain2.mp3 - Simplify your life

I noticed the opcode in the included editor does not show the opcode in orange, which is the typical colour. Can anyone else using the Android version confirm the audible abnormalities for me before I consider sending a ticket to github?