Why is Staad pro modifying input file after 2-3 analysis and/or closing/opening a file?

Hello

I am using Staad Pro v8i. I am designing a building with multiple frames and bays. I have added point loads at each node for every floor. After running fine for 2-3 times; Staad modifies the input file in such a way that the same load is applied on multiple nodes; though I had specifically added different loads at different nodes.


EG: 13 FY -100

2 TO 12 FY -200

1 FY -300

CHANGES TO

2 TO 13 FY -100

1 TO 12 FY -200

1 FY -300

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