ok…I played with this and discovered that the “link” styling in the widgetkit plugin has it’s own styling which means your thumbnail is wrapped in this tag but it has no alignment attribute, hence the left aligning of your image.
Solution one, insert a linked image with a caption (basic method of WordPress), change the link to the full image, add this
data-lightbox="titlePosition:inside"
into the tag.
Solution two, wrap your linked image with a span like this:
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You can adjust the margins by adding inline styling like style=”margin: 5px 5px 5px 20px;”