Important note: it's imperative you identify whether you're trading in an UP trend or DOWN trend. Notice how the left of the chart shows a clear UP trend, and as such the KC bands are expectedly hitting the UPPER band, then go down to the 21 EMA (mean reversion) until they again move up and stop around the UPPER band.
But beginning at the middle/right chart, the trend REVERSES - we're not looking at a DOWN trend. As such, the KC bands are hitting the LOWER band, then go up to the 21 EMA (-ish; mean reversion) until they again move DOWN and stop around the LOWER band.