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stream IO strange behaviour

stream IO strange behaviour

(OP)
Hi I am stuck on one serious problem. I am trying to add some block of bytes to the file.

procedure AddNewBlock(self : in out TLinHashManager) is
tmpBlock : TBlock := Create(self.blockSize);

begin
if self.isOpen then
Ada.Stream_IO.Reset(self.file, Ada.Stream_IO.Append_File);
self.fStream := Ada.Stream_IO.Stream(self.file);
WriteBlock(self.fStream, tmpBlock); --my procedure, is correct
tmpBlock.Dispose;
end if;
end AddNewBlock;

This procedure works fine until the file reaches certain size(around 2866 bytes). After that size, this code starts to add blocks to the begining and whole file seems to be connected from the end to the begining.
I've try everything(close and open file, set index of file and so on), but it doesn't work. HDoes anybody have any idea why this code is not working? I will be grateful for anything.

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