Import Item tagged with 1 added

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I have attached a model of a single matrix with a datalink and a text file to illustrate the problem encountered.
The text file has one line of data which the item matches with the matrix. However, when I do a datalink/update, the item is added to the matrix as a “new” item with a 1 tagged behind (ie Staffa 1). Why does this happen? What should I do so that the data (ie 5) is updated to the existing matrix of the existing item using datalink from a text file? Thanks.