The other day I was going to look for tasks in the archive, but I ran into a bug (feature). When I search for "ready", it gives me "Power sockets" task. Something went wrong? 
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The other day I was going to look for tasks in the archive, but I ran into a bug (feature). When I search for "ready", it gives me "Power sockets" task. Something went wrong? 
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Further investigation: depending on the selected archive task page, different tasks are shown. But still not related to the
readytheme.Auto comment: topic has been translated by KhB (original revision, translated revision, compare)
The same for word "class":
Auto comment: topic has been updated by KhB (previous revision, new revision, compare).
Try this payload on handle search:
<script\x20type="text/javascript">javascript:alert(1); ,
it should give "no such user" while it gives an error page. Might be vulnerable, I am not a tester. I was afraid to ask this in a post seeing a lot of downvotes in one of my posts.
Also words "remove", "click", "response", "function", "alert", "type", "toggle" and "codeforces" gives same result. Even parts of the link "sta.codeforces.com/s/" works in the same way.
It is really strange, that it works only on problemset page and gives only the first problem.