Split data into multiple Excel workbooks & tabs based on column values

I have a data set where the source data is 4 separate files that need to be combined & then split into a different set of files using one column (District) as the file name & another column (File) as the tab name. I have gotten my workflow to create the first District file with the separate tabs but the loop is not running for the remaining Districts. Where am I going wrong? I have attached my current workflow.

Combine Tables with Multiple Tabs Based on Column Value.knwf