Stevo: I tried it, but it didn't solve the problem. My guess is that it's registrating a mouse click in addition to the touch event.. (Whaat?!)
I'll test a little more and get back to you.
Schoening: Yes, I guess that's the only way to make it work.
Thanks both for your tips!
I've done a little more testing and it turns out it's browser specific. Both Chrome and Firefox works as expected on the same Samsung tablet, leaving the pre-installed browser to blame.
Motorola Xoom with Android 4.0.3 also triggers events twice.
These tablets only triggers once:
Samsung Galaxy Tab - Android 2.3.3
Google Nexus - Android 4.1 (Chrome browser pre-installed)
Asus Transformers - Android 4.0.3 - AppleWebKit/534.30 Safari/534.30