Record ¿un nuevo misterio?

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Prueba este sutil cambio:

Código Delphi [-]
TTrama = packed record
   Byte1: Byte;
   Byte2: Byte;
   Byte3: Byte;
   Numer1: DWord;
   Numer2: DWord;
   Numer3: DWord;
   Numer4: DWord;
   Table: Array[1..13] of byte;
End;

Empezado por Delphi Help

By default, the values in a structured type are aligned on word or double-word boundaries for faster access. When you declare a structured type, you can include the reserved word packed to implement compressed data storage.

Saludos!