USD/YPJ why is it so strange...?

Here's the deal...
I have been investing on a FXGame Acc for two months, and I believe I might have discovered a egy that's fairly ok. I just short when the market is overought ( over RSI 75) and long when the market is oversold ( under RSI 25).
Depending on the timeframe, I put TP of 5-7 pips on a 5 min timeframe, 10-12 on 15 minutes, and someimes 3-4 about 1 min. I have been doing so on EUR/USD. Because it was going too well I chose. . .what the hack I'll do it on additional pairs as well!! yay!
And I did it on my actual acc with Usd/Ypj....tis dawn 7:30 Europe time. BUT, the Yjp couldnt stop rising although it was oversold till RSI 90!! So my query is who transaction that pair. . .is that ordinary?
Ofc my SL got struck and I lost 1/20 of my sub-training account, wich I use still instead of Game acc, to become accustomed to the cash...
Apart from this, any1 else usuing a similar egy? Does it work for you?
Thx in advance.

Yeah I've discovered that, but I have heard as well not to trade USD/YPJ till I understand deeply the movement of the market...
precisely the same system seems not to work with various markets...

You've just discovered the inherent weakness of oscillators. Consider it an object lesson. Now it's time to move to the next lesson. How to cope with this specific problem? This can be a part of the learning curve.