No, polarity does not matter connecting them to the DW10.
By chance are you using the Sensors Test feature on the GC3? As an aside we have noticed severe inconsistency with the Sensors Test feature in the past on the GC3 panel.
The best way to test sensors is to test under normal alarm conditions. Place your account on test mode with the central station if you have 24/7 monitoring, and then arm your system.
Trip the sensors by tapping with the screwdriver handle on the pane. If the sensors learned in via activation this way and are programmed as Loop 1, you should have no problem activating them.