When you have 'Only buy if not already in positions' enabled, the trading bot will not place a new buy order if there is an open position within the current price range for the cryptocurrency.
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For example, if you configure 1 percent, the bot will not place a buy order if you own a position of the same currency that is either up or down less than 1 percent.

You can find this setting in your Base config under 'Buy settings'.