Every exchange around the world will set its own rate. The cryptocurrency conversion displayed on our webpage or through our partners may differ from the exchange rates shown by for example Google, or your wallet provider.
You can think of it the same as exchanging traditional currency. The rate you get when you convert fiat into another currency like USD is less than the rate you see on the news. Similarly, with crypto, the rate for converting into, for example, BTC is less than the rate on news sites or other exchanges.