Shift between the carrier frequency of the signal transmitted with arduino and my garage door RC (433 mhz)
The reason is that your garage door opening is operating on a different carrier frequency than your transmitter module.  The plot you are showing is called a &quot;waterfall&quot; plot and shows the frequency on the &quot;x&quot; axis with time progressing from top-to-bottom.
The garage door remote appears to be centered just above 433.900 MHz while your transmitter is around 434.000 MHz.  While that might not seem like a large difference, these things are designed to be receptive in a very narrow band.
So you need to read the specifications of your transmitter module and see if its frequency is adjustable and, if so, adjust it upward to the correct frequency.