Thank you for providing the CSV file and additional information.
Upon reviewing the CSV file, I noticed that the Z-coordinates (the third column) indicate significant variations in the terrain elevation. For example, the initial lines show coordinates such as:
407.704717532545 -518.458029091664 -3.60421894608029
475.204717532545 -522.788156110586 -3.69413811294243
Further down the file, around line 285, I see:
475.204717532545 568.403852657811 1.60586188705904
These coordinates indicate a height difference of approximately 5.2 meters (from -3.60 to 1.60), suggesting that the terrain is not flat. When sorting the data by the third column, the elevation ranges from a minimum of -5.04 to a maximum of 1.91 meters.
This explains why the terrain appears sloped in PVSyst and why the trackers seem to be hanging in the air at certain points. The variation in elevation points to an actual slope in the data, rather than an issue with the software.