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You need to look at where you are placing the imaged labels.
Take a piece of paper and mark it as a grid and write down in each grid the x,y values for the imaged label that is to go in that square...

Who wrote the subImageAdder() method?
Can you ask them how the code works?

Can you explain how your program works to generate the sub images.
Does it start at the top right and move down to the bottom and then move left one column and move down again?
How is it supposed...

How do execute your code? I don't see a main method.