Won't hold Left justification

I am a new user of powerpoint so I don't know some of the terminology to
describe the problem.

I am trying to make a powerpoint assembly instruction document. I use the
top box for text and below it I insert a picture and use dome of the drawing
tools to make text boxes and arrows that point to places on the
picture...There are two boxes for placing text. The top box says "Click to
add title". I want to use the top box to place some text. I want the text
to have the first line in 18pt Arial and the following lines in 14pt Times
New Roman. I want them to be Left Justified. I remove the bottom box and
insert the picture below the top box.

I enter text in the top box and format as described above. I then Save.
When I open the document again the text is as I entered it with the font and
font size correct, but the text is always Center justified.

What is happening here and how can I solve the problem?

Thanks,
Steve Krause