How do I get rid of previous results when calling a Table-Valued CLR Function?

Question

C++ / C#

I made a CLR assembly for MSSQL Server 2012, wrote a method that converts a string with a separator into an array of numbers:

[SqlFunction(FillRowMethodName = "FillRowCustomTable")]
public static IEnumerable Split(SqlChars value)
{
    return value.eStr().Split(';').Select(x => int.Parse(x));
}

public static void FillRowCustomTable(object resultObj, out SqlInt32 ID)
{
    ID = new SqlInt32((int)resultObj);
}

CREATE FUNCTION clr.Split(@Value NVARCHAR(MAX))
RETURNS TABLE(Value int) EXTERNAL NAME Regex.[SQLCLR.RegularExceptions].Split

Everything worked well, but after a while, the previous ones began to be added to the result.
For example:
After rebuilding the assembly, I execute the query AND I get the following results
SELECT * FROM clr.Split(@Val)

• @Val = "2", result: 2
  
• @Val = "1;2", result: 1.2
  
• @Val = "1;3", result: 1.3
  
• @Val = "1;3;4", result: 1,3,4
  
• @Val = "1;3", result: 1,3,4
  
• @Val = "9", result: 9,3,4
  

How to get rid of it?