Animation repeats once on first play

I have added just a simple Puzzle setup so two objects run their animation when clicked. The first time they are clicked, the first half of the animation runs twice before moving on to the next (which is the animation reversed). After that, the animation runs as it should – once forward, once backward, then stop.

The files are on the Verge3d Network in the STEMP-flythrough folder. The blender file can be downloaded from here: https://github.com/briligg/moonwards-colony-files/blob/master/Verge3d%20versions/STEMP-flythrough.blend