I've been having the same issue as ghadhika. It has been happening for the last 2 to 3 weeks and has persisted after a couple Opera updates.
I have all "Enhanced address bar" options disabled and have played with a few other toggles to troubleshoot. Nothing seems to fix it.
I'm currently using Opera version 122.0.5643.51 and Windows 11 Pro version 10.0.26100 Build 26100.