Altimeter different value

[PapaRomeo 40]

Hi all.
How do I align the altimeter setting?
My altimeter are not showing the same value as the one I set in the autopilot.
This happens when I set correct altimeter from weather changes.

[Mazen87 15]

Make sure you are setting the altimeter in the main instruments and not only back up altitude indicator. This is the only thing i can think of. What aircraft are you flying?

[PapaRomeo 40]

I have been flying the Cessna and Beach 36G, same problem with both.
In the Cessna, setting directly on the instrument, not flying the g1000, and does not align with autopilot.
Same with the beech, setting In the glass cockpit, and does not align with the altimeter IN THE SAME GLASS COCKPIT.