tx doesn't work

[rand0m666br]

Hi, I'm having an issue where the size I set on tx for the \tab isn't working.

Example:

{\rtf1\ansi\UTF-8\deff0{\fonttbl{\f0\fmodern\fcharset0 Courier New;}}\par\f0\fs22\b Parcial
de urina \par\pard\fs20\tx3000\tx3000\tx6000 \b Parâmetro \tab Resultado \tab
Referência \tab \b0 \par
\pard\fs20\tx3000\tx3000\tx6000 Volume: \tab \b 10 ml \b0 \tab \tab
\par\pard\fs20\tx3000\tx3000\tx6000 Aspecto: \tab \b Límpido \b0 \tab \tab
\par\pard\fs20\tx3000\tx3000\tx6000 Cor: \tab \b Amarelo claro \b0 \tab Amarelo Citrino \tab
\par\pard\fs20\tx3000\tx3000\tx6000 pH: \tab \b 5.0 \b0 \tab 5.0 a 6.5 \tab
}

Instead of increasing the space, it just stays as a normal \tab spacing.