Data from the wrong records being displayed

I think I’ve come across a rather serious problem. I have a page which filters records with a single search field. If another search is made, one of the columns updates correctly, while another shows data from the previous search.

I could be doing something silly, but I wouldn’t have thought this should happen in any circumstances. I’ve made a demo showing the problem here.

Looking at the MySQL query log, the query which is executed when the search for ‘aaa’ shown in the demo is made is:

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… which is what I would expect and which returns the correct results (but not the results which are displayed).