Generally, the Gmail blue bar indicator or selector for keyboard shortcuts follows a click on the conversation's selection box. For some reason, it's stopped doing that in one of my accounts. This is very frustrating as I use keyboard shortcuts often, mostly around conversations that I interact with.
The GIF below illustrates one of my healthy accounts:
This one is the account with the blue bar not following selection clicks. Note that keyboard shortcuts are activated, as evidenced by the fact that I use them during the screen recording here:
Any pointers on what might be happening?