forecast price csv: being overwritten + inconsistency?

I don't know what is going on with the forecasts, but I notice that

multiple experiment runs with same granularity and different horizon lengths write to the same directory, thus overwriting existing files
depending on the horizon length, the forecast csv file has different amounts of rows, which I don't understand why

Example

python run_benchmark.py --methods "market_auction" --spatial-granularities 1 --horizon-lengths 24 --output flavio_test # produces file `input/pypsa-eur-DE-1-nodes/muscle3/forecast-prices.csv with 25 rows (1 header + 24 rows of data)
python run_benchmark.py --methods "market_auction" --spatial-granularities 1 --horizon-lengths 120 --output flavio_test # produces file `input/pypsa-eur-DE-1-nodes/muscle3/forecast-prices.csv with >100 rows of data

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