"score_" - Argument doesn't work properly

My friend Johni and I are working on a PvP Map, and we wanted a new game only to start when at least 4 players have voted for any map.

But we also wanted that no new game would start if a there is already one running (of course).

So we created a scoreboard objective called inGame.
And we were checking with a clock whether there were players ingame to avoid double games etc.

But the comparator kept outputting a signal on a "testfor @a[score_inGame=1] - Command - even if there was no one with inGame on 1!

We tested this in multiple versions and I wonder if this happened to someone else, too.

For our Maps, check out http://youtube.com/CrushedPixel BTW 😃

Hope someone fixes this soon.

Thanks in advance,
CrushedPixel and Johni0702