Bitcoin had a price last night, according to the CoinMarketCap table, $ 8,738, and today its price has fallen by almost $ 500 and is $ 8,289. This is a manifestation of the usual price volatility of cryptocurrencies and is not directly related to the financial bubble. Moreover, the higher the price of bitcoin will rise, the greater the price amplitude of such volatility may occur.
The manifestation of a bitcoin bubble will manifest itself when it grows very quickly in its price, as it was at the end of 2017. What it led to, we have already seen.
Some traders and investors that targeted the $9k line probably removed some of their BTC, but it doesn't mean that it will last long since many positive investors aim to hold for now. It's not a bublle really or a correction. Price tends to move and up being a crypto that is volatile.