How do I not have data shuttle change Smartsheet data to blank?

I am using data shuttle to update information in smartsheet from an excel csv sheet. There are 6 columns I am having it update. When I run the data shuttle workflow it updates to the new source information including deleting the information in Smartsheet and changing it to a blank value. I have tried to use the filter option to isnotblank, but I am still getting deleted information in smartsheet to blank.

Image 1 is the information as it is in Smartsheet and Image 2 is it changing to blank after using the data shuttle workflow.

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