Action at 0ms within symbol is allways called twice

In Edge Animate 2014.1.1:

I wonder if its normal behavour that an action that i put at 0ms on the timeline of a symbol is called twice ( sometimes even more often, but i don't know why ) when i start the animation.

see http:www.pixelsymbiose.de/devpix/testing/test.zip for an example.

just one symbol with two grafics and an alert at 0ms on the timeline of the symbol.