What, if anything, should be done?
This happens from time to time; it's unavoidable when Stack Exchange sites have overlapping scopes. Here is another instance:
Now, if the author of the questions copied it without properly attributing it, attribution should be added (please don't assume malice, not everybody is aware of the rules). But given the picture in the first version of the question, that doesn't seem to be the case. (If anything, it looks like it's copied from somewhere else.)
You left a comment linking to your question on Puzzling, which is not required, but nice to generate some traffic. I've posted a link back; some users here might not be aware that a Puzzling site exists and vice versa.