Something damaged the #genre column before the search/replace was used. It appears that all the commas in #genre were replaced by letters from "Doctor Who". I have no idea how this happened. It doesn't happen for me using a similar test.
Questions:
1) What kind of column is #genre? My guess is it is a text column, given that there are no ":::" in the results preview.
2) Had you entered "Doctor Who" (or a phrase that ends with that) into any box on any tab of bulk edit, including search/replace?
3) Does it always happen? If so, run calibre in debug mode (click on the down-arrow next to preferences to do this), and post the results.
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