Looks like you have more than 6 Dimensions on the Rows shelf. You can change this to a higher number up to 16 by following the steps on this page: http://kb.tableau.com/articles/knowledgebase/avoiding-row-and-column-concatenation
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Go to Analysis> Table Layout> Advanced> then change the no. of rows and columns by default it is 6.
Hope this will help.
Thanks a lot
Thanks a lot. I got the answer