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Why have candlestick charts overlaps?
The market is simply gapping at these times, some news may have come out that makes the market gap on the open from its previous close. Being FX, the market in one country might be trading and then at the start of the hour trading in a different country may commence, causing a small gap in price. Generally many things could cause the price to gap up or down, and these gaps sometime can occur at the start of a new hour or other timeframe you are using. They do tend to happen more often at the start of a new day's trading on a daily chart, especially with stocks.