Dear Opera Team,
I am encountering this problem too and it's annoying.
It clicks the menu under the cursor immediately after the right-click menu shows up. I think it's a good idea to give some distance between the cursor and the appearing menu.
I hope this video gives you a clear explanation:
https://drive.google.com/file/d/1dGJKQ4EUTwW6Ril5ITxSHoxzTTMjH5Tq/view?usp=sharing
Here is my specification:
OS: Manjaro Linux 23.0.0 (Uranos)
Opera version: 101.0.4843.33
Please kindly fix it.