The EA Studio works on the current market conditions. This means that all strategies open the trades when the entry conditions are met. For example, when 2 moving averages cross each other. When the next bar opens, the trade will be executed.
Using pending orders is popular if you are using Support and Resistance or price levels. But when using indicators and there is an event (crossing of the MAs) which will place a Pending Order, the market could change until the Order is executed.
In simple words, the EAs that are generated with EA Studio trading at the moment according to the current market. And this is how it should be.