I have a Canon iP8720 printer. Why has some of my prints (11 x 14) come out looking kind of crooked even when I put the paper in straight?

For some of the prints, the whole image looks crooked not just the border. They look slightly crooked but not too much. I have a Mac. I have followed all the correct steps in printing a full image properly and I haven't touched the margin settings.
Update: The photo paper I use is from Inkpress media and it's luster photo paper for inkjet printers.
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