Trading tech and tools

I have two questions:

  1. I’ve noticed that the Marketmilk (FXCM) real-time price is always consistenty different than that of my broker (Hot Forex).
    For example: Today (10/21/20 @ 06:58am) the Marketmilk/ FXCM price on eurusd was 1.174705, and my broker/Hot Forex price at the exact same time and same pair was 1.18578. Why is that?

  2. What does that 6th digit on Marketmilk/FXCM signify?