Just a normal scenario for Bitcoin I guess.
September if you will look at the charts is really a bad month for Bitcoin but the remaining 3 months is one of the best months of it. I'm not saying though that from October - December, price of Bitcoin don't go down but if you will look at the history you will see that most of the time it goes up.

I think there is no need for an explanation into what is happening this month because it is expected already base on the history. One thing more is that the bulls are still in control of the market. We almost saw the Bears controlling it by seeing Bitcoin went down to below $30,000 but it didn't happen and instead the bulls prevail.