I am not familiar with the MAP scores or test.
Maybe that isn't statistically significant. I mean, 207 and 204 sound about the same to me. Does it seem like his reading is progressing?
Perhaps part of it could be- lots of kids are not reading in kindergarten, and half at the start of first grade aren't. Even second grade. So perhaps the curve is higher in second grade than kindergarten- like if the child is an early reader, they will score off the charts in kindergarten but not as much later on.
however, they could still be a great reader.