I second everything NoOne said and just want to add two things. First, the Talent Change Randomness can affect this, as well. But it's far from the sole reason. The main reason is, as NoOne said, prospects almost always decline in potential, which is true to life. For every Carlos Correa who lives up to the hype, there's a Dustin Ackley who is a big disappointment, and lots of guys who turn out to be decent players, but not the stars they were predicted to be.
Also, pay more attention to how they're performing than how their ratings change. If they're playing well, keep progressing them through the minors like you would if they were still a 5-star prospect. Your scout may simply be wrong in his assessment.
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