Google Spreadsheet nodes not consistent results

Hello,
I want to insert certain information to certain cells in google spreashsheet. I modified the code from the nodes and the code should work. However I get inconsistent results - some times only one part of the information is inserted, another time only another part, third time again some different part. This is rather strange because I am sure the code works and should work and insert all the information. I feel that at some point the node just decides not to listen and skips some values at random. What would be the reason for this?
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