I think it has to do with how you are attaching your photo. It is showing up as an attachment rather than showing up directly in your post.
1. Click on the 'Insert Image' icon from the icons shown above the box where you are typing your message. Make sure it says 'From Computer.'
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2. Select your file(s) and upload.
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3. Once the image appears in the box where you are typing your text, do a double click on it. That will open up an additional box. Select the size--generally I choose 'Large' or 'Full Size.' Then click OK.
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Be sure to preview your post then submit when you are finished.