Different results using the same setup Run and meteo data?

[misabel.garcia]

Hello everyone!
I am generating backtrajectories for 5 different locations (different lat, lon and altitude) in the same file. If I run the same calculation a few days later (same setup Run, same advance configuration set up, same locations, same meteorological files), I don't get the same results!!!. The changes in latitude, longitude, and altitude are small, but they vary. Why does this happen? If I haven't changed ANYTHING, why am I not getting exactly the same file?"