TIdTcpServer mixing clients

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Clients are identified with MAC address. Every client has its own log file. There are following successive lines in the code.

Code:

// 1. Write socket handle to log file.
LogMessage(AnsiString().sprintf("Handle %X", IdContext->Binding->Handle));
// 2. Write message data (TIdByte ByteArray) to log file.
LogData(ByteArray);
// 3. Send message
IdContext->Connection->IOHandler->Write(ByteArray, ByteArray.Length, 0);

1. Socket handle never changes.
2. Message data is correct. It is unique to client.
3. Third line sends message occasionally to wrong client.

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