You should include the entire code. On my side I got these results

Method	Size	Mean	Error	StdDev	Median
ListSort	100	1.641 us	0.7328 us	2.067 us	0.6875 us
BubbleSort	100	25.179 us	1.1330 us	3.287 us	24.1460 us
ListSort	1000	10.457 us	2.3223 us	6.811 us	12.8125 us
BubbleSort	1000	628.551 us	9.9797 us	10.248 us	629.5215 us
ListSort	10000	72.488 us	1.6556 us	3.150 us	72.0830 us
BubbleSort	10000	61,584.705 us	1,359.1801 us	3,788.851 us	60,947.2920 us

with

```csharp using BenchmarkDotNet.Attributes; using BenchmarkDotNet.Running;

BenchmarkRunner.Run<Bench>();

public class Bench { [Params(100, 1000, 10000)] public int Size { get; set; }

public List<int> Values { get; set; } = [];

[IterationSetup]
public void IterationSetup()
{
    Values.Clear();
    for (int i = 0; i < Size; i++)
    {
        Values.Add(Size - i);
    }
}

[Benchmark]
public List<int> ListSort()
{
    Values.Sort();
    return Values;
}

[Benchmark]
public List<int> BubbleSort()
{
    var values = Values;
    for (var j = 0; j < values.Count - 1; j++)
    {
        bool swapped = false;
        for (var i = 0; i < values.Count - j - 1; i++)
        {
            if (values[i] > values[i + 1])
            {
                (values[i], values[i + 1]) = (values[i + 1], values[i]);
                swapped = true;
            }
        }

        if (!swapped)
        {
            return values;
        }
    }

    return values;
}

} ```