this is an aysnchronous processing issue…
you are trying to start 3 processes at the same time…
but sometimes Spreadsheet1 will be received first, sometimes Spreadsheet2 and sometimes Spreadsheet3…
only start your further processing if all 3 processes have been downloaded successfully
So how can I be sure that all 3 get columns loaded?
Coimo could solve this problem?
You can Try this Way. 
see one possible solution in my screenshot above
read1
after receiving 1 then read 2
after receiving 2 then read 3
after receiving 3 then do the further processing
Taifun
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