Post images won't center align

My top image in my post has no problem being center aligned. NOr do the other banners in my psot – however one image within my post will not center align.

This issue has just started with some other images within my other posts. I have images that I set to align center. And the HTML it shows it's set at align center.

But no matter what I do the image just won't center. It will align left or right no problem. It just won't center. And I have cleared my cache.

The last time I had this happen I simply reloaded the image and things worked fine. This time – no joy.

Any thoughts on a work around for this?

I have included a link to the page this is happening on. If you scroll down you will see the image I'm having issues with.

Thanks in advance
Leo