(Powerpoint Presentation) Text boxes were disarranged when the presentation was opened on another computer?

i made a powerpoint presentation from mspowerpoint 2007. when i transfered the saved file to our main computer in our computer laboratory (that computer uses 2010), the textboxes got disarranged. what could might be the reason, is it because of the different size of the monitor i use to the monitor of the main computer, or because the different versions of ms office? help me please