Moving Averages Drawing Delay

Could you please give me a hint on how to programmatically solve an issue with Moving Averages being drawn only after number of bars specified by MA period have passed?

To make it clear I need to use an example. My algo opens a long position only if the current bid price is above Weighted Moving Average. Conversely, a short is opened with prices below the wma. Now, the problem is that when backtesting, on daily bars, the robot does not respect this criterion until specified period (let's say 150 bars) has passed, meaning that it opens both long and short positions regardless of WMA value.

My worry is that this will also be the case in real time testing.

Any suggestions, please?