The image appears to be linking back to the twitter image posted on twitter
Ah, that is the point I had missed, I see that now, when I delve down to the html detail. I do wish browsers would make (external) links completely obvious, so you know when you are heading off-site. Maybe some do, but not on Safari in this instance, iPad and MacOS at least, unless I am missing some config options.
Above all, good to hear it's ok!