Also, an easy way to get the device to invert the phase is to turn it off and then on again.
So, if you want to test this...
Do a capture, turn everything off, and then turn everything on again and do another capture.
If that doesn't do it, then turn everything off and try again.
Repeat until you get a capture with inverted phase. It sometimes requires several captures until you get two with a 180-degree phase difference.