Gaps on in the Spot Currency markets are not an indication of a lack of liquidity, as such should not be viewed as part of technical analysis as one would see in stocks or futures. These "gaps" are only seen on retail platforms. Institutional platforms, for example Currenex, do not have gaps, because these servers run 24 - 7 and are connected to the trading platforms. So the action is continuous, on the other hand, retail servers shut down, sometime on Friday and then reopen, usually sometime on Sunday P.M. The servers grab the first quote available from the Institutional server , if the price has moved up or down, in a significant way, this lack of data, not liquidity, shows up as a Gap in price.
In reality, this particular "Phenomenon", is not related to the different pricing from one Hub to another, or liquidity. But it is directly related to the difference between Retail and Institutional platforms.
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