1Password had history of leaking user data. IMO Bitwarden, Keepass or KeepassXC are better option.
May I clarify a little? If a link comes, we click on it, then we see that we are required to enter our password from the forum again, isn't this a signal for attention?
That's exactly what it is. If you are reading your PMs, that means you are already logged in to your account. If you are logged in, you don't need to log in again just to view another page of the forum unless you didn't tick the
stay logged in forever box and you got logged out account automatically after 60 mins or whatever count you entered in that field.
Also, if you were to hover over that link in PM with your mouse, the color of it should be blue since it is redirecting to an off-forum site. Forum posts are highlighted in green.
The sentence "Your session has expired. Please log in again." might let user guard down, especially if they didn't tick or don't remember whether they tick "stay logged in forever".