I've been having a lot of problems with Opera too, after I updated to Ventura.

The thing is, it's not Opera, it's macOS Ventura, it messed up the configuration for Opera now it's all messed up, I try to downgrade it and it didn't work so it's Ventura. Opera, or Apple need to find a fix

I recommend switching to chrome for a little bit of time until Apple on Opera fix this issue, I don't recommend switching to Safari because it's not really that good.

I also did some digging on the forms, all the cookie and password problems say that their operating system is macOS Ventura

I've been having a lot of problems with Opera too, after I updated to Ventura.

The thing is, it's not Opera, it's macOS Ventura, it messed up the configuration for Opera now it's all messed up, I try to downgrade it and it didn't work so it's Ventura. Opera, or Apple need to find a fix

I recommend switching to chrome for a little bit of time until Apple on Opera fix this issue, I don't recommend switching to Safari because it's not really that good.

I also did some digging on the forms, all the cookie and password problems say that their operating system is macOS Ventura