Let me step in here i did see more than few electrical code voilations allready
1] double tapping at main breaker that is a very serious no-no.
2] The GE breakers they are not listed for double lugged aka double wired.
3] the subfeed box used as second main breaker box IMO this is not a very safe pratice because if someone working on the subfeed box left of the main breaker box and someone turn off the main breaker and the subfeed box still alive that is very serious issue there
4] wooden panel cover that is a big no no also
5] doubled lugged at the netural bussbar
IMO the doorbell transformer should be outside of breaker box becuase the secondary side.
this breaker box should be replaced with proper breaker box with plenty breaker space in there
Let me add one more item i almost forgot but have to reedit this real quick
uncoverd repectales is a no no and the way the box mounted it sound like someone did not take the time to do this correctly