My Question is are you using the Loop check box on the top right of the macro? This loop is a simple and easy to use loop function but as soon as you have some complexity to you macro then you need to start using the inline loop fuctions.
The easiest way of doing this is with FOR LOOP
1 | FOR | I | = | 1 TO 55 | NEXT 2 | X | X | 750 | Keypress pgup 3 | 489 | 299 | 1400 | Left Click 4 | FOR | NEXT 5 | RUN ACTION | MESSAGE PROMPT | Task Completed::::0 So this will loop 55 times, you can change this number to the desired. I also removed the mouse position for your key press as it was not needed and changed your Left Click to condensed version.