At several points, Jesus tries to keep his status as Son of God a secret. This is known as the Messianic Secret and occurs mostly in Mark. But this is Matthew 8:1-4:
This makes little sense. The great crowds would surely have seen what has occurred, so how can it be kept a secret? I suppose infallibilists will say that the crowds were not necessarily that close to Jesus, and for this reason I file the problem as Minor.
However, to academic Bible scholars, it is obvious what has happened. Matthew, who used Mark as a source, has been sloppy in his copying. He has repeated the incident from Mark, but has added "great crowds" for dramatic effect. These crowds are simply not present in Mark's version, and Matthew evidently did not notice that adding them would create a problem.