not tested on TC55 however on this dropbox folder you can find the sample I use on my MC40 Android device.
Probably you've to disable ScanWedge to get the scanning event but I never saw what you're describing.
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I installed your sample and observed the same behaivour: the number was incremented without me doing anything besides from loading the view.
Once I disabled DataWedge, the issue is gone, both for the sample app and for my app.