Your offending image probably has a 'square' wrap format. If you change it to 'in-line', it'll probably behave the way the others do (which I assume are also 'in-line'). To do this, click on the image the, when the 'Picture Tools' tab appears on the Ribbon, click on 'Wrap Text' and choose the 'in-line with text' option.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]