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I just noticed that questions appear multiple times in my tag filter on enter image description here

Nothing against four times Jon Skeet in a row, but this seems to be a bug in the tag filter, as these questions only appear one time on the SE sites themselves. It seems to only affect newer questions, the older questions are unaffected in the same tag filter.

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SE's secret Jon Skeet cloning project seems to be going well. – hammar Jun 11 '11 at 22:08
This is also affecting the email alerts:… – bkaid Jun 12 '11 at 17:25
up vote 3 down vote accepted

We had a slight mishap over the weekend. A service that's responsible for aggregating activity across the Stack Exchange network (providing the lion's share of the data displays) got spun up twice.

This lead to a dueling banjos sort of affair where lots of content got "double aggregated" (technical N-aggregated, as you can see in your screenshot). The affects have been cleaned up, and I'm working on making the service a tad more robust in the face of this sort of failure.

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