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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I created a clone of your form and tried adding a new image. The new image aligns perfectly in the middle:
I believe that the original image was resized by dragging and dropping the corners and this created the alignment difficulty.
By adding a new image field and resizing by entering manually the values will solve this situation:
Please let us know if the problem persists.
You can also fix this issue by adding this custom CSS code as shown in screenshot. http://prntscr.com/4izmmg