In this question here it was asked if there are better algorithms for TSP than the naive brute force method. It received three answers, that all answer the question. After some hours, the OP changed the question to something quite different. The question is now something like "what is this summation and how to bound it". None of the answers now actually answer the question.
Should the question be reverted back to the original one? Should all the answers be deleted? In general, how should one react when the question changes to something completely different? I suppose this is awkward mostly if there are already multiple answers to the question.