Customization lost after update

Hi, as in subject i updated from 11.3.1 to 11.3.2 but i lost a lot of customization (hedaer, footer, settings, ecc).
I use a child theme.

Header: https://ibb.co/Z822Hmm
Footer: https://ibb.co/4g4x3VD

Why i lost my data? Could you help me to solve?

Thanks in advance

URL: https://www.simplybiz.eu/

ORIGINAL HEADER: https://ibb.co/tp8ZxyZ

I checked, my support period has expired, if it’s necessary to solve the issue i can renew the support.

Thanks